Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

Come for the waffles, stay for more waffles.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

Commemorating the spot where the famous scientist fed his pigeons.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Elevated freight railway turned wildly successful urban park.

Rummage through this sunken ship, but leave your scuba gear at home.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

On the Hudson resides one of the largest clocks in the world.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

A giant can of fruit cocktail is all that remains of what was once the world's largest cannery.

A life-sized mammoth sculpture marks the spot where the remains of a Columbian mammoth were discovered in 2005.

The Internet Age began with a transmission from this biker bar.

This odd California folly seems like it was almost designed to accumulate urban legends.

The world's most famous donkey lives in this pen.

The first high-tech company in the valley that actually worked with silicon devices.