The Caverns at Natural Bridge

The Caverns at Natural Bridge are a series of commercial show caves in the Shenandoah Valley of Virginia, close in proximity to both the Natural Bridge and Natural Bridge State Park. Discovered in the 1890s, it was opened to the public in 1977. The Caverns at Natural Bridge are the deepest commercial cavern on the east coast. The Caverns are home to two unique species — a beetle called the Natural Bridge Cave Beetle (Pseudanophthalmus pontis) and the Natural Bridge Isopod (Caecidotea bowmani).

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).