{"nrhp_refnum":"73000716","name":"Millstone Bluff","other_names":[],"category":"site","location":{"address":null,"address_restricted":true,"city":"Glendale","county":"Pope County","state":"IL","lat":37.469444444,"lon":-88.689722222,"geom_source":"wikidata"},"listed_date":"1973-10-15","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Prehistoric"],"significance_levels":["national","state"],"summary":null,"photo":{"url_800":"https://nationalhistoricalregister.com/media/73000716/5dc3914afe-800.webp","url_1600":"https://nationalhistoricalregister.com/media/73000716/5dc3914afe-1600.webp","licence":"CC BY-SA 4.0","author":"Daniel Schwen","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Millstone_Bluff_1.jpg\" rel=\"noopener\">Daniel Schwen</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Millstone_Bluff_1.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893916","wikipedia":"https://en.wikipedia.org/wiki/Millstone_Bluff","wikidata":"https://www.wikidata.org/wiki/Q6860041"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/pope-county/millstone-bluff-73000716/"}