A surrealist timepiece by the artist of melting clocks.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A Swedish farm is the world's only producer of the rare, creamy delicacy that is moose cheese.

The Swedish flag over this small naval fort signals that the nation is at peace.

Stockholm's deepest subway station is also a stunning ecological wonder.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

A wonderfully kitsch bookstore the size of a supermarket.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

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

The world's only museum devoted to the wonders of fluorescence.

Walk in the footsteps of the gods and straddle two tectonic plates.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Carved fountains poignantly placed in parks and in front of special monuments.

A huge stone pyramid built for fun.

On Japan's Tashirojima Island, cats are king.