This historic stone bridge has an entire neighborhood clinging to its sides.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Where the lovelorn find a home for their sentimental keepsakes.

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

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

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

Museum dedicated to the terror regimes of Hungary.

A musical instrument played by the sea.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A priceless collection of the Nation's cryptologic history.

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This grand gothic brewery has been pumping out suds for over a hundred years.