{"nrhp_refnum":"72001138","name":"Mill Grove","other_names":["Audubon,John James,House"],"category":"building","location":{"address":"Pawling Rd.","address_restricted":false,"city":"Audubon","county":"Montgomery County","state":"PA","lat":40.12663356050004,"lon":-75.44235303981473,"geom_source":"nps_gis"},"listed_date":"1972-03-16","is_nhl":true,"nhl_designated_date":"1989-05-05","areas_of_significance":["Art","Conservation","Entertainment/Recreation","Education","Science"],"significance_levels":["national"],"summary":{"what_it_is":"Mill Grove is a field stone colonial-design house in Audubon, Montgomery County, Pennsylvania, built in 1762 by James Morgan and later the home of John James Audubon. It is now a museum and wildlife sanctuary.","why_significant":"The nomination argues the property is significant chiefly for its association with John James Audubon, who lived there from 1804 to 1806 and studied the local birds. It describes his bird banding experiments at Mill Grove and his development of his method of wire-supported bird specimens, and it states that the historic events there are more important than the architecture.","narrative":"Built in 1762 by James Morgan in Montgomery County, Pennsylvania, Mill Grove is a stone colonial-design house with walls at least 18 inches thick and a wood shingle roof. It was the home of John James Audubon from 1804 to 1806, the years when he studied the birds of the surrounding land and made his early artistic efforts in America. Audubon made his own wire-supported method of mounting bird specimens here, and he carried out bird banding experiments, which are regarded as among the first attempts of their kind in North America. The house and grounds also show the early history of the Audubon family's ownership, which began in 1789 with his father, Captain Jean Audubon. Today the property is a museum displaying original Elephant Folio prints, and its sanctuary records 180 bird species. It is regarded as the only authentic Audubon home remaining in America.","period_of_significance":"1804-1806","architect_builder":null,"architectural_style":"Colonial","criteria":[],"status_note":"Serves as a museum and living memorial to John James Audubon, open to the public daily except Monday.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.81449-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/72001138.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/72001138/8d916ac2f9-800.webp","url_1600":"https://nationalhistoricalregister.com/media/72001138/8d916ac2f9-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Mill_Grove,_House,_Pawling_Road,_Audubon_(Montgomery_County,_Pennsylvania).jpg\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Mill_Grove,_House,_Pawling_Road,_Audubon_(Montgomery_County,_Pennsylvania).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71994551","wikipedia":"https://en.wikipedia.org/wiki/Mill_Grove","wikidata":"https://www.wikidata.org/wiki/Q6858325"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/montgomery-county/mill-grove-72001138/"}