Laurel Caverns is a large natural calcareous sandstone cave located 20 miles west of Confluence. Most of the passage ceilings in its three mile labyrinth are between ten and twenty feet high (many as high as 50 feet) with an average width of over twelve feet. This makes it the largest cave in Pennsylvania. The cave itself is situated beneath a 435 acre privately owned geological preserve. Because this property is at the top of Chestnut Ridge, all of the water that enters the cave is pristine.
Because of its size, Laurel Caverns is also the largest natural bat hibernaculum in Pennsylvania. In commitment to its preservation mission, the cave is closed during the primary months of the bat hibernation season, November through April. The cave is essentially empty of bats from May through October.