The hallucinogenic center of the ancient world.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A natural gas leak provides a flickering flame beneath a waterfall.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Stay in a room with a view... of the bottom of the ocean.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

Thousands of well-dressed mummies below a monastery.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Open-air museum with an elaborate sculpture garden, stretching for over 70,000 square-meters.

The final resting place for the remains of 143 Habsburg royalty.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

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

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Stalactites and stalagmites in a beautifully lit cave.

This grand mansion has starred in everything from Bones to Buffy.