This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

The mass grave of the 27 victims of the "Vampire of Hanover."

Striking occult iconography on a medieval German church.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

One of England's oldest stone churches and the birthplace of the "father of English history."

These 18th century gardens tell a rocky story of the son of Odysseus.

The patron saint of spinsters grasps a container of dried blood.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

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

The most visited, and possibly most controversial, museum in Germany.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The final resting place of the last "gypsy king" of Poland.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

Sweden's oldest street has not changed for nearly a millennium.

This legendary dessert was served to Nobel laureates for decades.

Sweden's first electric elevator remains hidden within a fortress-like building.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

The single richest source of elemental discoveries in the world.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

An ancient Viking runestone hidden in plain view in Stockholm's old town.