One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Jesus' footprints and the first catacombs in the world.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An alchemist's "magic door" stands in the middle of a Roman park.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An ordinary pond with fish from out of this world.

A moss-covered statue of a Japanese Buddhist deity stands at a quiet temple in downtown Osaka.

Strange secondhand shop showcasing taxidermy and oddies

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

A King Kong-like gorilla hangs from the top of this commercial building in Tokyo.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

No one knows who built this strange cave of worship or exactly why.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

An abandoned Art Deco hotel nestled on the side of a wooded mountain.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.