A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The middle finger of modernity.

Renaissance villa and gardens complete with a tormented colossus.

Stalactites and stalagmites in a beautifully lit cave.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Thousands of well-dressed mummies below a monastery.

A submerged archeological park still holds the wonders of a Roman Sodom.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A 16th-century horror show built in a lovely Italian garden.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A haunting collection of the vanished and disappearing natural world.

This massive library holds what was once the largest book collection in the world.

A museum of carnival attractions where you are invited to ride the rides.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

Norway's oldest cathedral still in use.

Thousands of years of crashing waves gave this mushroom-shaped rock its svelte figure.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.