Nondescript elevator doors open to reveal a stunning, surreal world.

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

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

A curious friendship between two inanimate ladies.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

NYC's legendary underground network for bovine transportation.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

There are owls with glowing eyes in Herald Square.

New York's oldest magic store.

A bit of retro transportation flair preserved in the world's largest department store.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

Cryptic messages embedded in the New York City sidewalk.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

An artist's cute bronze subway sculptures belie his violent artistic past.

Ride the subways of yesteryear.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

New York City's smallest piece of private property.

This innocent-looking townhome is actually a subway exit.

These ornate manhole covers were used for a now-forgotten purpose.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Unrepaired walls from a 1920 anarchist bomb attack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.