Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

This old mining town, deep in the California desert, has a year-round population of one.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

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

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Try not to get slimed in Tribeca.

A former connection to City Island, it has been abandoned since the 1930s.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Final resting place of two dozen New York City harbor ships.

Once America's longest-manned military fort, now an abandoned hulk.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

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

A formerly abandoned mental institute, now back in business.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

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

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.