The only road through the heart of Glacier National Park.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

A Circus legend leaves an unexpected endowment.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An outlandish shoe shaped house built by an eccentric millionaire.

It's a pretty creepy lock-up.

Step inside Lucy, the world's largest "elephant."

This elaborate towering structure was once famed for its revolutionary height.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

The only Florida state park with publicly accessible caves.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

A monument celebrating the idea of reaching inaccessible places.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.