Enchanted Rock Cave (United States)
Fredericksburg, TX

Enchanted Rock Fissure (United States)
Fredericksburg, TX

Glenwood Springs July 4th Celebration! (United States)
Two Rivers Park, Glenwood Springs, CO 81601

Hana Lava Tubes (United States)
Hana Highway, Haiku, Maui, HI 96708

Kula Kai Caverns (United States)
92-8864 Lauhala Drive, Ocean View, Island of Hawaii, HI 96737

Mark Twain Cave and Cameron Cave (United States)
300 Cave Hollow Rd, Hannibal, MO 63401-5386

Lincoln Caverns and Whisper Rocks (United States)
7703 William Penn Hwy U.S. Route 22, Huntingdon, PA 16652-4843

Mermaid Caves (United States)
89-410 Keaulana Ave, Waianae, Oahu, HI 96792-4109

Spider Cave (United States)
727 Carlsbad Cavern Hwy, Carlsbad, NM 88220-9463

Makauwahi Cave Reserve (United States)
Kalaheo, Kauai, HI 96471

Oregon Caves National Monument (United States)
19000 Caves Hwy, Cave Junction, OR 97523-9746

Jewel Cave National Monument (United States)
11149 US Highway 16 Building B12, Custer, SD 57730-8167

Lava Tube Cave (United States)
Queen Ka'ahumanu Hwy, Kailua-Kona, Island of Hawaii, HI 96740

Na Pali Makai (United States)
Kikiaola Harbor, Kekaha, Kauai, HI 96752

Kilauea Caverns of Fire (United States)
Between Hilo and Volcano off HWY 11, Kurtistown, Island of Hawaii, HI

Dunbar Cave (United States)
401 Dunbar Cave Rd, Clarksville, TN 37043-5725

La Jolla Caves (United States)
La Jolla, San Diego, CA

Sunny Jim Cave (United States)
1325 Cave St, La Jolla, San Diego, CA 92037-3684

Redmond Caves Recreation Area (United States)
SE Airport Way, Redmond, OR 97756

Louisville Mega Cavern (United States)
1841 Taylor Avenue, Louisville, KY 40213-1565