Rising from the sea like a stone monster.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Home of an evil witch famous within southern folklore.

Thousands of well-dressed mummies below a monastery.

The first declared National Monument in the United States.

Monasteries on rock pillars, once accessible only by frayed ropes.

Enormous lake at the bottom of a unique cave system.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Northern Ireland's Brobdingnagian stepping stones.

Two stunning 17th-century libraries and a cabinet of curiosities.

Famously misunderstood wonder of the ancient world

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

Odd outsider art installations surround a Gold Rush-era ghost town.

Mysterious rocks that ring musically when struck.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Try not to get slimed in Tribeca.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.