Caves famous for the dragon-slaying saint who lived there.

Virgil's many-mouthed gateway to the underworld.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

A bike being "eaten" by a tree is the real Vashon legend behind popular children's book, "Red Ranger Came Calling."

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

Obelisks and stone pineapples in the Irish countryside.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Every color in the rainbow awaits.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Eighty million natural history specimens call this gargantuan museum home.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Wonderland replication in progress by one persistent man.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

A beautiful maze marks where three countries meet.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A walkable map of the world, made from soil and stone by one man.