The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

The Devil’s own choice when he needs a drink in Brussels.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

These spooky and unusual stone formations create an underworldly landscape.

A 12th-century fortress containing some of Berlin's oldest buildings.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Art and a pun, all in one.

A collection of abandoned typographic signs from Berlin and beyond.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A slice of central Asia in the middle of Berlin.

An eerie, derelict amusement park in Berlin.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The world's longest and deepest train tunnel.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Macabre museum devoted to historical Viennese murders.