{"nrhp_refnum":"74000766","name":"Alton Military Prison Site","other_names":["Illinois State Prison"],"category":"site","location":{"address":null,"address_restricted":true,"city":"Alton","county":"Madison County","state":"IL","lat":38.8917,"lon":-90.1906,"geom_source":"wikidata"},"listed_date":"1974-12-31","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Historic - Non-Aboriginal","Architecture"],"significance_levels":["national"],"summary":null,"photo":{"url_800":"https://nationalhistoricalregister.com/media/74000766/f8b98ed339-800.webp","url_1600":"https://nationalhistoricalregister.com/media/74000766/f8b98ed339-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Alton_Military_Prison_remains.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Alton_Military_Prison_remains.jpg"},"district":{"nrhp_refnum":"78001165","name":"Christian Hill Historic District","url":"https://nationalhistoricalregister.com/districts/illinois/christian-hill-historic-district-78001165/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893565","wikipedia":"https://en.wikipedia.org/wiki/Alton_Military_Prison","wikidata":"https://www.wikidata.org/wiki/Q16152499"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/madison-county/alton-military-prison-site-74000766/"}