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

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

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

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

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

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Berlin's old airport.

Floating swimming pool within a moored vessel.

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".

A fascinating insight into daily life in the Eastern Bloc.

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.

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

Time has been frozen at this station since the bombing in 1980—or so it was believed.

The location where a famous medieval knight was murdered.

Everyday, fans from across the globe visit the statue of one of the greatest Formula One drivers in history.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

A masterpiece of modern architecture that caused quite a stir in Paris, recreated in Bologna half a century later.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

Constructed during the 1960s, this bridge is still the highest in Italy.

This building features dozens of faces along its facade, although one is a bit chilling.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

This uniquely designed bridge served as the city gate for Comacchio.