This historic stone bridge has an entire neighborhood clinging to its sides.

Beloved children's TV characters freckle the German city's streets.

These crumbling monastery ruins inspired a master of German Romanticism.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

One of the newest mosques in a city filled with thousands.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Ancient serpentine sacrifice holder that has stood the test of time.

Pugs with antlers are found all over the city as a homage to one of its most famous cartoonists.

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.

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

A moving and macabre World War I-era painting by the great artist Otto Dix.

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

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.