The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

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

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

Iceland's tribute to its thankless civil servants.

This stunning concert hall has become a symbol of Iceland's national recovery.

This tiny museum's sizable collection is jammed into a former underground public toilet.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

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

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

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

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

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's tiniest statue is of a small boy looking at the Moon.