You may have heard of the Sinks of Gandy, but even the name is misleading. The sinks refer to a cave system through which the waters of Gandy Creek pass, and if you have not passed though it as well, you should definitely plan on it.
Near Spruce knob in Monongahela National Forest, Gandy Creek disappears into a cave, eventually reemerging from the other side. These are the Sinks of Gandy.
The cave itself is a 1.5-mile (8,114 feet) Limestone structure passing beneath a large meadow. First discovered in the early 1830s, the cave was the sight of a shootout during the Civil War in which a small group of Confederates who robbed a store were shot and killed by a group of Union men.
Be sure that you bring a flashlight and a change of shoes because even if you do find the dry entrance, (follow the link at the end to lean more) you are likely to get a little wet along the way, or at the very least a little muddy.