Berlin's oldest surviving academic architecture hosted decades of animal dissections.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

This stately council chamber hasn't changed since 1545.

The elegant manor house where Kaiser Wilhelm II lived in exile after World War I.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

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

Unchanged for centuries, this medieval library keeps its books in chains.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

A unique collection of gilded age mechanical pianos.

An intricate and amazing house built by architect Karl Junker.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

A beautiful maze marks where three countries meet.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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."