{"nrhp_refnum":"09000936","name":"Middlesex Canal Historic and Archeological District","other_names":[],"category":"district","location":{"address":null,"address_restricted":true,"city":"Boston","county":"Middlesex County","state":"MA","lat":null,"lon":null,"geom_source":null},"listed_date":"2009-11-19","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Engineering","Social History","Transportation"],"significance_levels":["state","local"],"summary":null,"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63796117","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q112328538"},"indexable":false,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/middlesex-canal-historic-and-archeological-district-09000936/"}