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

A slice of central Asia in the middle of Berlin.

A quaint Russian village in the middle of a German metropolis.

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

One of downtown Berlin's last reminders of its Communist past.

The "Prussian Versailles" that is as glorious today as when it was built.

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

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

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

A surreal museum of extraordinary industrial objects.

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.

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

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

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

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

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

Sweden's southernmost point is located in this charming fishing village.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

These ancient rune stones plucked from the countryside now call this university park home.

This millstone commemorates a gruesome tale that may have been the source of the city's name.