{"nrhp_refnum":"74001640","name":"Markham Mound","other_names":["Lewis Williams Mound","Zaleski Mound Group,Mound #2"],"category":"structure","location":{"address":null,"address_restricted":true,"city":"Zaleski","county":"Vinton County","state":"OH","lat":null,"lon":null,"geom_source":null},"listed_date":"1974-05-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Prehistoric"],"significance_levels":["local"],"summary":null,"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71991800","wikipedia":null,"wikidata":null},"indexable":false,"url":"https://nationalhistoricalregister.com/ohio/vinton-county/markham-mound-74001640/"}