A trove of ridiculously valuable prints and manuscripts under one roof.

The Swiss hilltop housed an early 20th-century vegetarian nudist colony.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Walk through a restaurant's refrigerator door to reach this hidden bar.

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

Museum of science fiction, utopias, and extraordinary journeys of the mind.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

An avant-garde artist is survived by his seaside garden.

A 550-square-meter micro-nation off the coast of Britain.

Dictionary Johnson’s favorite feline.

A cluttered and astounding collection of antiquities and curiosities.

This hidden green space is the city's second largest conservatory.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

Artworks by loners, prisoners and the criminally insane.

The university library shaped like a giant piece of Swiss cheese.

Where Mary Shelley’s "Frankenstein" and John William Polidori's "The Vampyre" were born.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

A rare, flower-shaped example of Brutalist architecture in Switzerland.