This postmodern apartment block was designed to be a vertical neighborhood.

This lucky bronze frog was gifted to Madrid by a casino.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

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

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

A small house in Tazones, completely covered in shells.

Two large posteriors in one giant statue.

The surviving remnants of a destroyed medieval church now stand in a public park.

The much-loved protagonist of famed Argentinian comics can be found sitting on a park bench.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

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

One of the world's heaviest musical instruments towers within a popular urban park.

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

Tiny memorials honor individual victims of the Holocaust.

A monument to the man who almost killed Hitler.

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

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

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

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

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

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

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