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

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

The land is home to swimming ponies and a legendary 18th-century treasure.

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

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

Florida castle built with aluminum printing plates.

Abandoned silver mine strewn with wrecked and twisted structures.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A tribute to Ponce de Leon's supposed quest for eternal youth.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

When ecosystems collide in the arid Southwest.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A haunted hill that supposedly defied gravity.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

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

One man's ambition created this psychedelic log home.

Strange red rock formations that have been attributed to a higher power for hundreds of years.