Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Roman ruins top white travertine terraces formed by ancient hot springs.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

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

A tiny chapel clings to a precipice above Germany’s gemstone capital.

This 600-year-old home seems to defy physics.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Berlin's old airport.

An eerie, derelict amusement park in Berlin.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

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

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

Giant topiary dog once played a role in a terrorist bomb plot.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

This massive subterranean fissure is known as the "underground Grand Canyon."

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

American soldiers discovered Europe's best one-liner at the end of World War II.