For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

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

A monument to the man who almost killed Hitler.

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

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

Where once there was a train station bathroom, there is now this German burger joint.

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

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

A historic Christian shrine nestled within a spectacular natural cave.

This enormous censer uses a pulley system installed over 400 years ago.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

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

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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