Black Chasm Cavern is at 15701 Pioneer-Volcano Rd. The cavern has foot-long crystal formations, large rooms and deep turquoise lakes. Visitors descend 60 feet (152 steps) on a 45-minute tour to view stalactites, draperies and flowstones. The Landmark Room is known for its array of white helictite crystals. The temperature within the cave is a constant 57 degrees F. Visitors also can search for gemstones and follow an above-ground nature trail.