These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

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

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

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

The final resting place of many of Germany's most famous communists.

One of downtown Berlin's last reminders of its Communist past.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A fascinating insight into daily life in the Eastern Bloc.

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

Reminders of the Battle of Berlin still scar the railway.

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

Tiny memorials honor individual victims of the Holocaust.

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

Berlin's old airport.

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

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

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

A monument to the man who almost killed Hitler.

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

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.