The prototype for all Nazi concentration camps.

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

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A church of bones, decorated with 40,000 human skeletons.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

One of the most controversial statues in Romania is an emperor with no clothes.

Romania's triumphal arch looks out over Bucharest.

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The most peaceful "country" in the Middle East.

This ancient village is peopled by a religious minority and is still using some of the same materials it was built with thousands of years ago.

A striking symbol of the Bulgarian capital.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.