This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

There has been an astronomical clock on this spot since the 14th century.

A beautiful and classically designed villa, with an hourly infestation of monsters.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

This bridge was constructed from the rubble of the infamous Bastille.

The famous winding walk at Chartres is surrounded in mystery and myth.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The largest free-standing aquarium in the world resides in a hotel lobby 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.

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.

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

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

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A restaurant and observation deck built in a unique broadcasting antenna.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The most visited, and possibly most controversial, museum in Germany.