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

Explore the complex ecology of this multifaceted nature preserve by riverboat.

This small train ride offers stellar views of the Grand Garden Palace.

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

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

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

Tiny memorials honor individual victims of the Holocaust.

A fascinating insight into daily life in the Eastern Bloc.

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

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A pair of connected skyscrapers form this symbolic gateway.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A misnamed well, with a deep dark past.

Arguably Belgrade's only example of pure Art Deco architecture.

Near Belgrade, an ancient-looking sarcophagus serves as a World War I monument.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A condensed piece of China floating in a Dutch harbor.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

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