An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A unique urban square characterized by raw concrete structures and bold geometric forms.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

Third time's a charm, or in this case, two testicles are.

This site commemorates the life of a Japanese scientist who dedicated his life to the discovery of diseases.

Unbeknownst to many, an ancient burial mound hides in plain sight in Ueno Park.

This strange mural located in the Ueno station is filled with traditional Japanese symbolism.

A Buddhist temple on an artificial island that houses a monument to the fugu fish.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Tragic reminders of the 1945 firebombing campaign over Tokyo still haunt this bridge.

The original "capsule building" is a masterpiece of Metabolist architecture.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

Steampunk, humanoid sculptures crawl on all fours in a Tokyo plaza.

The decommissioned steam engine’s whistle can still be heard three times a day at one of Japan’s oldest train stations.

This quirky collection of furniture also happens to be a public art installation.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

A 20-meter (65-foot) robot towers over Tokyo Bay.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Time has been frozen at this station since the bombing in 1980—or so it was believed.