The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

Lady Liberty's original designer installed a little clone in this French fountain.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

A medieval military street hidden beneath a charming French fishing village.

This garden houses the remains of the ancient Greek port of Marseille.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

An abandoned swimming pool decays on the outskirts of Berlin.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Taste freshly foraged yarrow and black locust blossoms at this ambitious cocktail bar.

Once a path for Jewish funeral processions, this unassuming alleyway is rich in local lore.

Reminders of the Battle of Berlin still scar the railway.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

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

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A 12th-century fortress containing some of Berlin's oldest buildings.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Started as a kitchen garden, now the second largest botanical garden in the world.

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.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

According to legend, this tomb holds the secrets to time travel.

This Underground station has been a popular filming location for decades, even before it closed.