A suspended footbridge allows for traversing this gorge carved through the French Alps.

This tower once served as a radar station during the Cold War.

This mountain trail inspired Nietzsche to complete his magnum opus.

Legend has it fairies gathered at the site of this medieval castle.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Walk through living pictures and music in the Cathedral of Images.

A chapel on a volcanic core, marking the end of a successful journey.

Abandoned medieval hill town.

The location of the last witch trials of Italy, known as "The Salem of Europe."

An abandoned village, frozen in time by the threat of a landslide.

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

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Enormous sandstone towers loom within a Czech forest.

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

Artfully arranged bones of 5,800 Austrians.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

This doorless 20th-century elevator doesn't stop or slow down.

The first museum in the world devoted to sexual gadgetry.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.