Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Two stunning 17th-century libraries and a cabinet of curiosities.

France's most famous cemetery, with some of its most curious tombs.

A Gothic cathedral created from volcanic rocks.

A church of bones, decorated with 40,000 human skeletons.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

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

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

A fascinating insight into daily life in the Eastern Bloc.

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

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Where once there was a train station bathroom, there is now this German burger joint.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A monument to the man who almost killed Hitler.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

Started as a kitchen garden, now the second largest botanical garden in the world.

The "Prussian Versailles" that is as glorious today as when it was built.

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

When the rain falls, this drain system turns into a musical instrument.

Over 12,000 hygiene oriented objects and exhibits.

One of the largest busts in the world celebrates the German city's erstwhile namesake.