Luray Caverns Luray VA Luray Caverns is the largest cavern in the Eastern US. It was discovered by Andrew Campbell in 1878. Its most famous features are the stalactites and stalagmites. Definitely worth a visit. We visited on Thanksgiving Day. X marks the spot of the original discovery of the caverns. So many different formations throughout the caverns. It is amazing. Stalactites hang from the ceiling. The famous stalacpipe organ. Stalagmites grow up on the bottom of a cavern from the same drip-water source, the mineral from which is deposited after the water droplet falls across the open space in the rock. Underwater lake reflects like a mirror the stalactites. Another reflective lake. Pretty cool.