Some of the tallest ancient American ruins continue to inspire awe and curiosity.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Series of storm drains connected to a dark urban legend.

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

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Here’s how Robert the Doll earned his reputation as the most haunted doll in the world.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

Little Red Lighthouse under the George Washington Bridge.

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

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

A popular European tradition makes its way to the states on one of America's most famous bridges.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

One of the world's largest model railroads is a mind-boggling achievement.