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

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

An Italian hillside ghost town.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

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

A submerged archeological park still holds the wonders of a Roman Sodom.

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

The most powerful waterfall in all of Europe.

This ghost town in Belgium will lose its street art when it ceases to exist.

This abandoned Belgian fortress is purposefully being left to nature.

A haunting deserted hotel is a favorite with artists and photographers.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

An abandoned nightclub has become a vibrant work of art.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

This historic black and white monastery is one of Bulgaria's architectural jewels.

An abandoned saucer-shaped monument in the Bulgarian mountains.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

A flamboyant five-story building in Bulgaria resembles a crawling snail.