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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

As telephones become more essential and less stylish one historic Brooklyn building remembers the days when they were a grand celebration of communication.

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

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Storage warehouse of the rich and famous.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

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.

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

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

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

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

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

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