Unique tower has outlasted a takeover of the company.

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

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

One of the few surviving "Wigwam"-themed motels.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

An abandoned theme park with a strange and tumultuous past.

The world's longest known cave system.

Moonbows over Kentucky.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

These boots are made for selfies.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

An unrealized Taoist palace left abandoned in a Houston suburb.

A private collection of massive steel monsters guarding a Texas pipe works.

There is an unmarked red button hidden over Houston's Buffalo Bayou that is just begging to pushed...

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

One of few remaining antique carousels with stationary animals in the U.S.

Metal water storage tank turned ethereal concert hall.

This iconic science fiction house still looks like something from the future.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.