A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A monument to the man who almost killed Hitler.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

These old doors are covered in the signatures of Rehoboth Beach artists dating back to the 1930s.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

The final resting place of one of the United States's greatest poets.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

This giant disembodied horse head seems to balance impossibly on its nose.

A glittering Thai Buddhist temple in suburban Pennsylvania.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

An exotic wildlife habitat right off The Strip.

A giant open-air sculpture made of over 200 full-sized boats.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

One of the oldest surviving Swedish-American homes in the United States.

This park contains a number of standing stones meant to heal and inspire.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Come for the Italian food, stay for the taxidermy and giant statues.