Kartchner Caverns State Park‘s main feature is a show cave with 2.4 miles of open passages. The park is located nine miles from the town of Benson and west of San Pedro River on the east side of the Whetstone Mountains.
The caverns, discovered in 1974 by local cave explorers, are carved out of limestone and full of spectacular speleothems, some of which have been growing for more than 50,000 years. There are several tours organized every day.
They usually cover about half a mile and last between one and two hours. No self-guided tours are available. Trained guides tell visitors the story about the cave discovery, the speleothems created by water and limestone interaction and the plants and animals living in the cave.
2980 AZ-90, Benson, AZ 85602, (website link)