The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

The remains of what was once the world's steepest passenger funicular.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

A giant gun barrel in Barbados that once hoped to shoot outer space with science.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

A Barbados crypt where it's said that the coffins refuse to stay put.