Housing the groundbreaking maps and globes of Gerard Mercator.

Lavish royal estate punctuated with heated greenhouses.

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

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

The steepest classic funicular in the world glides along a dizzying incline.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Caves famous for the dragon-slaying saint who lived there.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

This 1,400-year-old abbey was once a powerhouse for music and intellectualism known across Normandy.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

This ancient theater was once the home of fierce gladiatorial battles.

Legend has it this 11th-century castle was paid a visit from the devil.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

The deserted pirate-themed restaurant still entices explorers.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.