This recessed garden protects thousands of mountain plants by creating its own microclimates.

A surrealist timepiece by the artist of melting clocks.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This massive library holds what was once the largest book collection in the world.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

The oldest stone house in Paris was built by its most famous alchemist.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

Eat a tasty meal in the house where John Steinbeck was born.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

A great example of the inventive canal bridges that were deliberately split down the middle.

A majestic mansion designed in Mughalai style, complete with a turquoise onion dome.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.