One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

A Byzantine-era church hidden in a wooded area below the Acropolis.

The unusually large seat sits atop the base of a ruined temple.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

An innovative local park built from an abandoned sewage treatment plant.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

Singapore's oldest Hindu temple.

A centuries-old church stands as a testament to Boston's "father of architecture."

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

A coal fire has been burning underground here since 1896.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

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

The ruined doorway is a portal to the building's turbulent and torturous past.

A tunnel with windows, so you don't miss out on the impressive views.

A collection of venomous snakes and reptiles for the whole family to enjoy.