The celebrated eyesore created by starry-eyed sweethearts.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Historic medieval fortified city in southwest France.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Berlin's old airport.

Metro station with a claim to rock n' roll fame.

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

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

This monumental work of art symbolizes the coming together of a previously divided city.

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

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.

Ruins of a German castle on top of a towering stone pillar.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This small exhibition displays equipment and artifacts once belonging to the feared Stasi secret police.

Retirement home for giant obsolete machines.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.