Complex tile installations designed by a renowned Polish artist in a Warsaw subway.

One of Warsaw's coolest malls was once a center for anti-Nazi resistance activity.

A symbolic cemetery in a suburban square marks the birthplace of Poland's WWII resistance movement.

This alluring underground library, hidden in a suburban Metro station, features a Space Age aesthetic and its own hydroponic garden.

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

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

Berlin's old airport.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

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

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

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

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Atop this library is one of the most beautiful green spaces in Warsaw.

This bell stars in a tragic love tale and is said to make wishes come true.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

Special benches that play Chopin's music are scattered throughout his native city.

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

This hidden collection of everyday objects illustrates life within communist Poland.

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