If you've ever wanted to tear Hello Kitty apart with your teeth, this is the place.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The attic of a four-century-old canal house hides a clandestine church.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

Mosaics created from 11 million cigar bands.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

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

An collection of Chinese propaganda posters from 1949 to 1979.

A striking symbol of the Bulgarian capital.

A fascinating insight into daily life in the Eastern Bloc.

Art and a pun, all in one.

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

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A brush maker used his factory to protect blind Jews from the Gestapo.

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

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

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

An eerie, derelict amusement park in Berlin.