Austria's 5-star prison.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Ride a dragon train into a world of dwarves.

Sidney Scurvy, the interactive computer sailor, takes you on a journey to discover the everyday lives of Cook and his men.

A vortex fountain that seems to rise out of the ground.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

450 dead and frozen fish, proudly on display in Japan.

Deadly airliner crash preserved for those willing to climb and pay respects.

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

Sumptous memorial to a controversial independence.

A dictator's gold statue once rotated to face the sun on a 75-meter high marble tower.

A huge monument to a bizarre book written by Turkmenistan’s longstanding dictator.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

These tracks are believed to be from a panicked dinosaur stampede.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

White cockroaches and other cave species occupy this massive series of lava tubes.

Visit this playground of waterfalls, caves and sinkholes.

Hiding the longest subterranean river known in the world.

A cave's rare beauty held a cavernous secret hidden underground.

A salty cave excavated by elephants and the location of a deadly disease vector.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Thousands of bats stream out of caves every night on the edge on Thailand's second largest park.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.