This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

After sitting unused for decades, this abandoned communist infrastructure became a wildlife utopia.

The second-highest train station in Europe.

A stunning architectural yet functional feat, towering over Oslo.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This automated sculpture of two men peeing will spell out text messages with their micturition.

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

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

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

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Looming communist pillar with a Czech twist.

Walk through Czech history in Prague's largest graveyard.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Museum devoted to the artificial language of Esperanto.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Where beer lovers can literally immerse themselves in beer.

A historic observatory precariously perched at the "Top of Europe."

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.