This once-derelict building is now one of the most beautiful bookstores in the world.

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

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

One of England's most famous churches hides a pair of little known architectural treasures.

This skewed English house has looked like it's going to fall over for centuries.

A wonderfully eccentric Victorian-era museum and library.

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

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

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

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

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

The first museum in the world devoted to sexual gadgetry.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Paris' linguistic guide to the international language of, yes, love.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.