This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

This public space is speckled with the eerie remnants of a defunct amusement park.

The graffitied ruins stand hidden within the Pennsylvania woods.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This might just be the TARDIS of bookstores.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

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

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

Mysterious rocks that ring musically when struck.

One of the first sewers in the Americas.

A pre-Columbian ceremonial and astronomical site built by the Taino Indians.

A monument of the man who spurred Copiapó's silver mining industry.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.

Locals visit this abandoned train tunnel where a man took his own life to ask favors of his spirit.

The geographical center of Chile is a port so depressing that it has driven men to suicide.

A fantastical and futuristic temple of light built from nine monumental glass veils.

The largest stone moai on Rapa Nui.

The legendary bathing site of a Moorish queen is actually part of a Roman fish farm.

This ancient rock painting is the oldest evidence of humans’ love affair with honey.

A series of well-preserved ruins show the culture of the ancient Benehoaritas people.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

A somewhat mysterious biomedical museum housed inside a Spanish university.

A once-secret library of Freemason history in Catalonia.