An unassuming secret door once led to a legendary watering hole.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The oldest surviving synagogue in New York City is now a soaring art space.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Nikola Tesla's former home contains an homage hidden from plain sight.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

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

A celebration of capitalism in Midtown.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

New York City's smallest piece of private property.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

Read a book next to a Midtown waterfall.

A dilapidated dock tells the story of Titanic's missed arrival.

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

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.