On the National Historic Register, the 2,400-acre Park showcases crystal-filled Colossal Cave and historic La Posta Quemada Ranch, a 128-year-old working ranch. Guided tours and advanced caving treks are conducted on a daily basis. The headquarters of La Posta Quemada Ranch is a historical museum and research library. Exhibits explain the human and natural history of Colossal Cave Mountain Park and the Cienega Corridor.