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 overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

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

This modest marker near Notre Dame identifies the very center of Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

Notorious artist squat renovated into legal studios.

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

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

5,000 skulls in memorial to those killed by the Khmer Rouge.

One of the biggest markets in Asia, under one of the continent's largest domes.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

A battle between nature and architecture in the Cambodian jungle.

A haunting tribute to pioneering photographer Clover Adams.

Built in 1945, this historic train station has a new lease on life with its baggage area serving as an event space.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

Concerned residents saved this historic house and garden from demolition.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.