Indian Echo Caverns

"Despite being a “show cave” with all the trappings of a tourist scene, these sparkling limestone caves in Derry Township, Pennsylvania are too gorgeous to avoid just because they’re famous, and like just about anywhere, they have a story more interesting than their leaflet lets on. On a bluff along Swatara Creek is an accessible entrance to the caverns, thought to have served as a shelter or food storage for the Susquehannock Indians, despite no real evidence of this being left behind. The natural accessibility and size of the cave makes it hard to believe it was overlooked for its usefulness, which was surely capitalized on by French fur trappers in the late 17th century, long after the Susquehannock had gone."