Kartchner Caverns State Park
Kartchner Caverns State Park is a state park of Arizona, United States, featuring a show cave with 2.4 miles (3.9 km) of passages. The park is located 9 miles (14 km) south of the town of Benson and west of the north-flowing San Pedro River.
Source: Wikipedia — Kartchner Caverns State Park (CC BY-SA 4.0)