Elevated freight railway turned wildly successful urban park.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

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

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Bell tower juts out from a village buried under a lake.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This simple roadside art installation ended up sparking a folk art movement and a controversy of international proportions.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

This demon atop the Notre-Dame de Paris looks utterly bored.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Eighty million natural history specimens call this gargantuan museum home.