It houses the remains of a 17th-century version of the Titanic.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A celebration of solstice followed by a fiery purging of evils.

The site of the first battle of World War II.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The oldest stone house in Paris was built by its most famous alchemist.

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

This memorial museum chronicles the apocalyptic destruction of the First World War.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A rare example of World War I trenches from the British front.

Theme park featuring miniature replicas of European monuments.

For over 100 years the most important physicists in the world have autographed this university wall.

The 20-mile causeway that separates the Netherlands from the sea.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

Science meets wall art to highlight the beauty of famous mathematical equations.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

This miniature take on the Kremlin is one Dutch man's retirement project.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.