A museum dedicated to exhibiting remarkable outsider art.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

The most confusing clock in New York.

A living archive of urban activism and space reclaimed.

The greatest real estate coup of all time.

The notorious headquarters of a corrupt political machine.

Cryptic messages embedded in the New York City sidewalk.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A very classy 1920s-era bar right in Grand Central Station.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Slyly buy a shake in the Parker Meridien lobby.

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

A crumbling hospital from the 1850s on Roosevelt Island.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A graffiti Mecca welcoming artists from around the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."