Douglas County Colorado (Vacant / Not In Use) has 2 places on the National Register of Historic Places including 1 place of National significance and 1 place of Statewide significance. Significant places include Lamb Spring and Franktown Cave.
Prehistoric cultural affiliation(s) include Proto Historic, Archaic, Early And Middle Ceramic, Paleo-Indian and Pre-Clovis dating back to 10999 BC. Prominent architectural styles found in Douglas Country are .