The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

This is the real-life “Phantom of the Opera” box from Gaston Leroux's 1910 novel.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Marvel at the opulent Art Nouveau interior while dining on dirt-cheap French classics.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

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

Catacombs turned marketplace.

More than 5,000 years old, D27 is the largest dolmen in the Netherlands and was already standing long before Stonehenge and the Egyptian pyramids were built.

Visitors can still take a train to this former train station turned museum.

An Amsterdam School landmark combining a museum and social housing.

The world's first transgenic bovine has been preserved at the museum where he spent his final years—though his old stable is now a cafe.

One of the largest sandsculpture installations in the world, this exhibit boasts a unique combination of sprawling sand scenes, theological musings, and salvaged shipwrecks.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

A pillar is all that remains of a church built to honor a peculiar miracle.

This museum features over 100 playable pinball machines, some dating back to the 1850s.

The oldest skyscraper of Europe now stands dwarfed by the surrounding structures.

The grave of the famous painter is marked by a simple stone in the ground.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

A bridge that has seen many reiterations over its lifetime.