Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Two Civil War-era cemeteries stuck between runways at the world's busiest airport.

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

This former maximum-security prison is creepy, sobering, and supposedly haunted.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

Inside this small brick bungalow is a collection of toys intended for the afterlife.

This now-deactivated naval base defended the Florida coast for centuries.

The crumbling ruins of this southern American fort have survived storms, war, and cults.

A bizarre roadside attraction and the first instance of miniature golf in the world.

An abandoned theme park with a strange and tumultuous past.

The world's largest collection of the world's largest objects is in one small Illinois town.

One man's vision and a labor of love of many.

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

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

The former home of the hard partying literary power couple is now one of the only museums devoted to their story.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

One person's lost luggage is another person's treasure.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

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

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.