This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Sweden's oldest animated sign is still lighting up the skyline today.

The library's graceful rotunda is like a bibliophile's temple.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

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.

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

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

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

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

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

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

This suburban British town holds secrets that would have made the druids proud.

A series of playful yellow penguins share a serious message about the environment.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This Communist-era residential block is one of the longest residential building in Europe.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.