{"nrhp_refnum":"04001202","name":"Natural Bridge Caverns Sinkhole Site","other_names":["41cm281"],"category":"site","location":{"address":null,"address_restricted":true,"city":"Natural Bridge Caverns","county":"Comal County","state":"TX","lat":null,"lon":null,"geom_source":null},"listed_date":"2004-10-29","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Prehistoric","Exploration/Settlement","Industry"],"significance_levels":["state"],"summary":null,"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40971542","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q72339768"},"indexable":false,"url":"https://nationalhistoricalregister.com/texas/comal-county/natural-bridge-caverns-sinkhole-site-04001202/"}