This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

A Museum of Psychiatry in a still-operating mental institution.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

Christ's blood preserved in a Belgian town.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

A rare example of World War I trenches from the British front.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

This abandoned Belgian fortress is purposefully being left to nature.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Meet the bronze beloved pet to a family of famous peeing statues.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

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

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

An abandoned swimming pool decays on the outskirts of Berlin.

One of the world's heaviest musical instruments towers within a popular urban park.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

The final resting place of many of Germany's most famous communists.

Cold war icon and onetime "hole" in the iron curtain.