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

Thousands of well-dressed mummies below a monastery.

A battle between nature and architecture in the Cambodian jungle.

The first declared National Monument in the United States.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

A spectacular cave and a beguiling lake.

Enormous lake at the bottom of a unique cave system.

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

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

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Northern Ireland's Brobdingnagian stepping stones.

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

Famously misunderstood wonder of the ancient world

A seemingly endless landscape of pure salt stretches far across Bolivia.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Notorious artist squat renovated into legal studios.

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

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

Stunning wetlands ablaze with pink lotus flowers.

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

An enormous, inside-out glass globe built in 1935.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.