Berlin's old airport.

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

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Tiny memorials honor individual victims of the Holocaust.

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

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

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

A fascinating insight into daily life in the Eastern Bloc.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

A collection of noses tucked inside an art museum reveals how times have changed.

Old Danish castle immortalized in Shakespeare's Hamlet.

This sublime architectural marvel is a rare example of an expressionist church.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

Copenhagen's celebrated theme park and gardens.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Site of the first radio and telephone broadcasting companies in Copenhagen.

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

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.