Inner Space Cavern

Inner Space cavern was discovered by a Texas Highway Department core drilling team in the Spring of 1963. Six inch core samples were taken to determine if the ground was stable enough to support a large highway overpass. As they were drilling one of the test holes, the bit suddenly dropped 26ft. and the highway crew knew there was something down there besides rock.

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Cumberland Caverns

Cumberland Caverns is one of the most extensive known caves in Tennessee. Portions of this caving system were originally known as Higgenbotham Cave and Henshaw Cave. Considerable exploration of previously unseen sections along with integration of the two caves substantially enlarged the Caverns to the more than 32 miles that can be toured today.

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NCA Directory

America's Best Showcaves!

Just about everywhere you go, you can explore the underground wonders of a nearby NCA showcave.

Showcaves Offshore

    

Members: The directory is available for download in pdf format under Member Resources.

Hana Lava Tube
Turn left off Hwy 360 @ MM31,go 4/10 mile to Lava Tube
Hana, HI  96713
808-248-7308
Harrison's Cave
Welchman Hall
St Thomas, Barbados  
246-417-3700
The Crystal Caves of Bermuda
P.O. Box CR 232
Hamilton Parish, CR BX  
441-293-0640