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      <Form990PartVIISectionAGrp>
        <PersonNm>Susan Costa</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Margaret Howland</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>David Gomes</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Eugene Monteiro</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Christina Bascom</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ralph Martin II Esq</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Hon D Lloyd Macdonald</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>James Hughes</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Edward Howland II</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Betsy Fallon</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Hardwick Simmons</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Anthony Sapienza</PersonNm>
        <TitleTxt>Chair</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Bernadette Souza</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ricardo Bermudez</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John Garfield Jr</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Douglas Crocker II</PersonNm>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Paulina Rocha Arruda</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotalOtherCompensationAmt>63606</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>4</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>false</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
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        <Desc>Admissions</Desc>
        <BusinessCd>711190</BusinessCd>
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      <ProgramServiceRevenueGrp>
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      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <BusinessCd>711190</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>7904</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Royalties &amp; User Rights</Desc>
        <BusinessCd>711190</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>94140</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Programming</Desc>
        <BusinessCd>711190</BusinessCd>
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      <LessRentalExpensesGrp>
        <RealAmt>233592</RealAmt>
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      <RentalIncomeOrLossGrp>
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      <NetRentalIncomeOrLossGrp>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>1948022</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
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      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>145848</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>145848</TotalRevenueColumnAmt>
        <ExclusionAmt>145848</ExclusionAmt>
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      <GrossSalesOfInventoryAmt>361197</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>341279</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>19918</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>20398</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>-480</UnrelatedBusinessRevenueAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>Miscellaneous</Desc>
        <BusinessCd>711190</BusinessCd>
        <TotalRevenueColumnAmt>3993</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>3993</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>3993</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>7664413</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1224405</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>-11375</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>542996</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>313513</ProgramServicesAmt>
        <ManagementAndGeneralAmt>231005</ManagementAndGeneralAmt>
        <FundraisingAmt>211446</FundraisingAmt>
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        <TotalAmt>1492504</TotalAmt>
        <ProgramServicesAmt>1231252</ProgramServicesAmt>
        <ManagementAndGeneralAmt>189772</ManagementAndGeneralAmt>
        <FundraisingAmt>71480</FundraisingAmt>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>41847</ProgramServicesAmt>
        <ManagementAndGeneralAmt>12054</ManagementAndGeneralAmt>
        <FundraisingAmt>7274</FundraisingAmt>
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        <ProgramServicesAmt>175426</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36236</ManagementAndGeneralAmt>
        <FundraisingAmt>14560</FundraisingAmt>
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        <ProgramServicesAmt>139189</ProgramServicesAmt>
        <ManagementAndGeneralAmt>42166</ManagementAndGeneralAmt>
        <FundraisingAmt>20789</FundraisingAmt>
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        <ProgramServicesAmt>48840</ProgramServicesAmt>
        <ManagementAndGeneralAmt>130000</ManagementAndGeneralAmt>
        <FundraisingAmt>2125</FundraisingAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>1625</TotalAmt>
        <ManagementAndGeneralAmt>1625</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>36073</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
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        <ManagementAndGeneralAmt>7800</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>143161</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15854</ManagementAndGeneralAmt>
        <FundraisingAmt>11625</FundraisingAmt>
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        <ProgramServicesAmt>16529</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18643</ManagementAndGeneralAmt>
        <FundraisingAmt>4031</FundraisingAmt>
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        <ProgramServicesAmt>132479</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7310</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>82869</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>3295</ProgramServicesAmt>
        <FundraisingAmt>2537</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>51723</ProgramServicesAmt>
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        <FundraisingAmt>2523</FundraisingAmt>
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        <ProgramServicesAmt>2881</ProgramServicesAmt>
        <ManagementAndGeneralAmt>860</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1005982</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36000</ManagementAndGeneralAmt>
        <FundraisingAmt>4000</FundraisingAmt>
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        <ProgramServicesAmt>106282</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9224</ManagementAndGeneralAmt>
        <FundraisingAmt>5314</FundraisingAmt>
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        <Desc>Exhibition Costs</Desc>
        <TotalAmt>287912</TotalAmt>
        <ProgramServicesAmt>287912</ProgramServicesAmt>
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        <ProgramServicesAmt>84408</ProgramServicesAmt>
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        <ProgramServicesAmt>90438</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Student TransProgram Travel</Desc>
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        <ProgramServicesAmt>140261</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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        <ProgramServicesAmt>363131</ProgramServicesAmt>
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        <FundraisingAmt>55266</FundraisingAmt>
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        <ProgramServicesAmt>5016068</ProgramServicesAmt>
        <ManagementAndGeneralAmt>948549</ManagementAndGeneralAmt>
        <FundraisingAmt>445180</FundraisingAmt>
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        <EOYAmt>1618</EOYAmt>
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        <EOYAmt>935573</EOYAmt>
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      <PledgesAndGrantsReceivableGrp>
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        <EOYAmt>2189930</EOYAmt>
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        <EOYAmt>1292921</EOYAmt>
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      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>138263</EOYAmt>
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        <EOYAmt>170058</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>32730565</LandBldgEquipCostOrOtherBssAmt>
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        <EOYAmt>14043520</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
        <BOYAmt>16354325</BOYAmt>
        <EOYAmt>18577693</EOYAmt>
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        <BOYAmt>770676</BOYAmt>
        <EOYAmt>847620</EOYAmt>
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        <EOYAmt>38197196</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>226589</EOYAmt>
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        <EOYAmt>682602</EOYAmt>
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        <EOYAmt>155786</EOYAmt>
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      <OtherLiabilitiesGrp>
        <BOYAmt>129589</BOYAmt>
        <EOYAmt>133358</EOYAmt>
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        <FormAndLineReferenceDesc>Not reporting collections (Part III, line 1a)</FormAndLineReferenceDesc>
        <ExplanationTxt>In accordance with U.S. generally accepted accounting principles (GAAP), the Collection, which were acquired through purchases and contributions since the Societys inception, are not recognized as assets on the Statement of Financial Position.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Collections descriptions (Part III, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society has been collecting historical artifacts, manuscripts, rare books, and photographs since 1903. Today, the Collection comprises over one million items. Collections include objects across a broad range of categories: fine and decorative art, folk art, photography, domestic artifacts, objects that represent the history of technology and industry, books, manuscripts, maps, and charts. Native and Indigenous material culture, clothing and textiles, and extensive personal, business, and financial records. Collections relate to the Societys mission in one of two ways: either to regional histories or to ocean science and global maritime collections.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Endowment funds intended uses (Part V, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>The Societys endowment fund is generally donor restricted to support the preservation of the Collection and to provide specific operational support in accordance with donor stipulations.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other revenues included on Form 990 (Part XI, line 4b)</FormAndLineReferenceDesc>
        <ExplanationTxt>Adjustment for activities shown gross for audited financial statement reporting and netted for Federal Form 990 reporting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other expenses included on Form 990 (Part XII, line 4b)</FormAndLineReferenceDesc>
        <ExplanationTxt>Adjustment for activities shown gross for audited financial statement reporting and netted for Federal Form 990 reporting.</ExplanationTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Michelle Taylor</PersonNm>
        <TitleTxt>Chief Administrative Officer &amp; CFO</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Naomi Slipp PhD</PersonNm>
        <TitleTxt>Crocker Endowed Chair-Chief Curator</TitleTxt>
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        <ExplanationTxt>The Treasurer is assigned the responsibility for the review and approval of the information and income tax filings at the direction of the Finance and Executive Committees. The Executive Committee of the Board of Trustees receives the complete package of required Federal and Commonwealth of Massachusetts information and income tax filings upon Treasurers approval and prior to filing with the respective Federal and State agencies.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Conflict of interest policy compliance Part VI line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Trustees of the Society provide self-declarations of possible conflicts of interest as part of their annual meeting responsibilities. Key employees provide an annual self-declaration as part of their annual performance appraisal. Potential conflicts identified are reviewed and approved if appropriate as part of the Board of Trustees routine responsibilities.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CEO executive director top management comp Part VI line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Committee of the Board of Trustees performs an informal review of salaries of the Chief Executive Officer for comparable responsibilities in like size museums and other similar institutions within the community. Discussions are documented as part of the recording of the minutes of the Board of Trustees including their formal approval of the adjusted compensation and benefits.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other officer or key employee compensation Part VI line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Committee of the Board of Trustees performs an informal review of salaries of key managers for comparable responsibilities in like size museums and other similar institutions within the community. Discussions are documented as part of the recording of the minutes of the Board of Trustees including their formal approval of the adjusted compensation and benefits.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Governing documents etc available to public Part VI line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society makes all Federal and Commonwealth of Massachusetts information and income tax filings available upon request. The Commonwealth of Massachusetts Attorney Generals office makes all corporate filings available at their web site upon filing. Other organizations make the Federal information and income tax filings available at their web sites.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>List of other fees for services expenses Part IX line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Federal and Commonwealth of Massachusetts compliance reporting fees.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>List of other expenses Part IX line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>See detail of other expenses. Other expenses are a detailed breakout of the more significant of expenditures by functional basis and includes the reclassification of rental and museum store expenses to the Statement of Activities as required for the Federal Form 990 reporting.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>General explanation attachment</FormAndLineReferenceDesc>
        <ExplanationTxt>The Audit and Risk Committee reviews and approves the auditor selection for recommendation to the Board of Trustees. Part XI Reconciliation of Net AssetsAdjustment for change in value of split interest agreements.</ExplanationTxt>
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</Return>