High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

This home on a quiet suburban street is completely covered with vibrant mosaics.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

Eighty million natural history specimens call this gargantuan museum home.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

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