A vintage penny arcade hidden in the back of a fun fair-themed bar.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

The storefront of a ramshackle Parisian puppet theater.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

The final resting place of the "father of special effects."

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A modern-day Lascaux cave underneath Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

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

A museum of carnival attractions where you are invited to ride the rides.

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

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

Traveling collection of amazing automata.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A domino effect created with Britain’s iconic telephone boxes.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This London plaque marks the spot where David Bowie's famous alien made his debut.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

This secluded walkway overlooks a magnificently wild London green space.