A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

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

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

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

A historic observatory precariously perched at the "Top of Europe."

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

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

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

"World machine" built by an untrained Austrian farmer.

The world's most important buildings shrunk to a tiny size.

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

Austria's 5-star prison.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A Gothic cathedral created from volcanic rocks.

This half-finished "city of toys" was almost Italy's own Las Vegas.

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

A saintly relic hidden in a Prague church basement.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

This massive subterranean fissure is known as the "underground Grand Canyon."

A miniature train-ride through Slovenia's largest cave system.