The world's longest known cave system.

A former 19th-century tavern, famous for its peach brandy and honey concoction.

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

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

An abandoned town is hidden in Great Smoky Mountains National Park.

A cannonball from Union forces battling John Hunt Morgan made this church a permanent home.

An ode to "The Queen of Appalachia."

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

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

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

Moonbows over Kentucky.

Over 120 years ago, the original boardgame that inspired Monopoly was invented in this small Illinois town.

Once known as the Illinois Asylum for the Incurable Insane.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

Elvis's own personal tropical hideaway.

This two-room shotgun shack in Tupelo is the birthplace of a King.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

These mysterious ruins are hidden amid this sleepy coastal city.