In the summer, the area around this sculpture transforms into a vibrant concert venue.

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

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

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

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

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

The site of the first battle of World War II.

An underground city of salt.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

Op-art architecture designed for happiness.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A helicopter memorial commemorating what was once the only way to access this West Berlin exclave.

A small hippo-shaped fountain in Berlin, Germany.

A statue of an astronomer gazes at the sky as a tribute to Caroline Herschel.

This museum is home to a sugar sculpture of the Berlin Airlift Memorial.

This monumental work of art symbolizes the coming together of a previously divided city.

Art installations, derelict railcars, and endangered grasshoppers all call this south Berlin park home.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This sprawling Jewish cemetery is one of the largest in Europe.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

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

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