A bizarre form of natural mummification was discovered in the church of this Frisian village.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

Two gravestones clasp hands over the religious divide.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

A grassy pyramid named after a French battle.

Peek through a transparent pyramid and drink in the mountain made of books.

Ruins of a German Castle on top of a towering stone pillar.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The fairy tale castle of the "fairy-tale king."

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

A wunderkammer of mysterious objects and stories.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Art and a pun, all in one.

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.