This little museum is built on a theater that was once a wildly elaborate speakeasy.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Unlock the secrets of the conjuring arts.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A hip bar decorated with walls of golden skulls.

Four cars from the old system were once on display, but were removed in 2014.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Whether you're up or down, the Elevator Museum is worth a stop.

Sip coffee and talk politics at this landmark cafe in Astoria's Little Egypt, a contender for the title of America's first hookah bar.

The phone booths of New York City have all but disappeared, but their remains were once found in this "graveyard," sadly now removed as well.

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

This tiny store is your one-stop shop for all sorts of rare and wonderful buttons.

The saddest little diner in New York.

NYC's legendary underground network for bovine transportation.

An accidentally hidden library containing the ephemeral history of New York.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

Visit the site of a subway powered by nothing more than air--and lots of it.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Fabrication workshop where the encasement for One World Trade Center's beacon was constructed.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.