(Colorado)
Roxborough State Park is a state park of Colorado, United States, known for dramatic red sandstone formations. Located in Douglas County 20 miles (32 km) south of Denver, Colorado, the 3,339-acre (13.51 km2) park was established in 1975. In 1980 it was recognized as a National Natural Landmark. (Ref: https://en.wikipedia.org/wiki/Roxborough_State_Park)