A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

A modern-day Lascaux cave underneath Paris.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Claude Monet was baptized in this lavishly ornate Paris church.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This small museum displays a collection of outsider art and scale models of past "treatments" for mental illness.

The excellent Swiss museum of witchcraft is led by a modern witch.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

World's largest permanent maze made of 18,000 conifers.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

Large Hadron Collider and the Birthplace of World Wide Web.

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

A historic observatory precariously perched at the "Top of Europe."

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

These spooky and unusual stone formations create an underworldly landscape.

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

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

A beautiful gorge filled with streams and waterfalls.