The celebrated eyesore created by starry-eyed sweethearts.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A little sculpture with a large wardrobe.

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

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

An icon of International Style architecture on the outskirts of Rotterdam.

The former headquarters of history's oldest megacorporation.

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

Home to three historic ships from the age of Vikings.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

An alien church provides much needed silence in the midst of a Finland shopping center.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.