This museum houses an imposing skeleton army comprised of creatures great and small.

A mechanized clock where a man fights off a dragon, crab, and rooster.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A Nesting Doll of Churches.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Bowl in splendor, if you're lucky.

Slyly buy a shake in the Parker Meridien lobby.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

One of only two commuter aerial tramways in the United States.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

This influential Renaissance-era library was once the haunt of kings and monks.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

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

Abandoned Nazi train station turned underground astroparticle laboratory.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A 16th-century Andalusian palace.