This maze-like slot canyon is a unique gem within an already fascinating geological area.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

An enormous natural sandstone bridge in Kentucky.

The remains of this visionary community can still be found much as it was a century ago.

This abandoned cemetery has a dark past of bodies buried over bodies.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

Moonbows over Kentucky.

This abandoned nuclear cooling tower casts a shadow over a bucolic town.

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

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

This defunct, fortress-like prison has been the setting for several movies.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Home of an evil witch famous within southern folklore.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.