The "Prussian Versailles" that is as glorious today as when it was built.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

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

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

A fascinating insight into daily life in the Eastern Bloc.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A museum glorifying the life of Stalin, located in the city of his birth.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

The first skyscraper to include a Ferris wheel built into the facade.

Underground monastery and fortress.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

With over 10,000 lights, this engineering marvel lights up the city after dark.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

When the Soviets destroyed the historic Armenian monastery they somehow left its bell tower intact.

You'll find just about anything in this funky Tbilisi flea market.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

Longest fortress system anywhere in Europe.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.