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

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

France's most famous cemetery, with some of its most curious tombs.

The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

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

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

Known as the "Forgotten City" it was home to industry, riots, artists, squatters, and to one of the largest single disaster fires in New York City.

Queen Anne style apartment house built in 1886.

The return of something once considered a basic part of life.

A way to take your secrets to someone else's grave.

An unconventional space for art and science housed in a massive old warehouse.

A decommissioned military complex that's now a modern industrial park.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

A modern zoetrope on the New York City subway.

Walk into the 19th century without leaving Brooklyn.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

A room in New York City that contains 250 cubic yards of dirt.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

One of only two commuter aerial tramways in the United States.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

A World War II officers' club features Old West murals painted by German POWs.

Mysterious glowing orbs float through the desert night.