Caves famous for the dragon-slaying saint who lived there.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

These spooky and unusual stone formations create an underworldly landscape.

The fairy tale castle of the "fairy-tale king."

Visitors dip into a variety of pools of what was once ice.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Humble beginnings for one of the world's most famous scientists.

Yugoslavia's biggest underground airport lies in ruins.

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

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A surreal museum of extraordinary industrial objects.

This classic restaurant features a gorgeous mirror-clad room.

Discover the taste of mold.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.