Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

A steel paper plane is all that remains of a crashed aircraft that caused an amazingly small amount of damage.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

"Only the dead get off at Kymlinge."

The internet as provided by a James Bond villain.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

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

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

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

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

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

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

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A charming and enigmatic sculpture of a lynx haunts the park of Kellinghusen.

This little museum is built on a theater that was once a wildly elaborate speakeasy.