An unfinished rail tunnel that has since been used to house cheese and bats.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

A man's home is his castle.

The world's largest set of the ten commandments lay nestled in the heart of the Great Smoky Mountains.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

All that's left of the quintessential "cabin in the woods."

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A natural sandstone bridge hidden in the Sewanee forest.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

These early tent-shaped grave coverings are unique to Appalachia.

Visit this playground of waterfalls, caves and sinkholes.