This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

A unique seaside cave where Aleister Crowley faked his own death.

A submerged village appears when dam levels drop.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

The towering Pinocchio stands 63 feet tall in the Italian village his creator frequented as a child.

This magical-looking island is notorious for the misfortunes suffered by its owners.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

Windblown rock formations in an ancient Roman quarry.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A young Italian couple has been locked in an embrace for over 6,000 years.

The world's most active stratovolcano is almost always erupting.

Romans built the world's tallest artificial waterfall in 271 BC.

The giant skeleton sculpture is surprisingly well-traveled.

Walk through a fairytale in Tuscany.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

A sunken idol welcomes parishioners to Davy Jones' Locker.