From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

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

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

More than five miles of underground passageways.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

A building so large that it has its own weather.

The smallest post office in the United States is no bigger than a broom closet.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

A mega theme park-wax museum mélange containing all things biblical.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

World's first "penitentiary," meant to be humane, drove men insane.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This quirky curiosity shop takes its cues from the world's bazaars.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Gutted airplanes slowly decay in a Florida field.

Intertwined, interspecies trees which locals believe can grant boons to lovers.