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.

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

The beautiful, ornate weather station is the most popular geocache in Salzburg.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The final resting place to 300 Victorian-era pets hides inside the city park.