Hideout of thieves, monks, and goat-footed gods.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

The final resting place of the poets Shelley and Keats.

This structure among the trees was the result of divine inspiration.

An eccentric playboy's astounding natural history collection.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A museum dedicated to exhibiting remarkable outsider art.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

An encyclopedic collection of mammal penises.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A botanic garden full of trees twisted into fantastic shapes and positions.

"I did this all while you were watching TV."

A six-story-tall golden pyramid, surrounded by a moat.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A strange history museum, with items accumulated by a pair of globe trotting spies.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

The world's largest set of the ten commandments lay nestled in the heart of the Great Smoky Mountains.

Roman-era ships unearthed...

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

Ever hear of the Milazzo Cage?

A large spinning bath of liquid mercury, used to probe the early universe.

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

An optical illusion found amid a logged redwood forest.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.