The most powerful waterfall in all of Europe.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The history and future of cannabis.

A curious collection dedicated to human and animal anatomy and pathology.

Museum preserving torture methods from the past.

The world's only museum devoted to the wonders of fluorescence.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

This stunning concert hall has become a symbol of Iceland's national recovery.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

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

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

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

Berlin's old airport.

Blitzkrieg bop your way through Berlin's Ramones Museum.

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.

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