Gang fights don't just happen on the streets, they happen under them too.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

A sculptural commentary on capitalism pokes up from the East River.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Site of the first pathological and bacteriological research facility in the United States.

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

A crumbling hospital from the 1850s on Roosevelt Island.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

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

The best place in New York to pick up the controversial, notoriously foul-smelling Asian "king of fruits."

The greatest real estate coup of all time.

The competition: breathe deeply as long as you can.

New York City's only radical feminist independent bookstore.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

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

Salute the leader of the proletariat.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

The oldest living tree in Manhattan comes shrouded in sinister legend.

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

The notorious headquarters of a corrupt political machine.

A terrific purveyor of natural history objects and curios.