This watchtower once presided over the Berlin Wall.

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

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

Modern art commemorates one of the first military actions of World War II.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The site of the first battle of World War II.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

In this small cemetery lies the grave of one of England's greatest football strikers, who died too soon.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A restaurant and observation deck built in a unique broadcasting antenna.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A fascinating insight into daily life in the Eastern Bloc.