9 Dangerous and Forbidden Underground Places in New York

New York is the state most Americans think they already know. Skyscrapers, subways, the skyline everyone has seen a thousand times before ever setting foot there. But underneath that familiar surface, and scattered across the much larger, much wilder rest of the state beyond Manhattan, sits a version of New York almost no one has actually seen: a document vault carved into a mountain of limestone that stores the Magna Carta, a tunnel where hundreds of homeless New Yorkers built an entire underground society that lasted more than a decade, and a hundred-mile aqueduct so large that engineers still call it the longest tunnel of any kind ever built anywhere on Earth. This video counts down nine real underground places in New York, all of them documented in state historical records, engineering reports, or ongoing government infrastructure projects. Several are actively dangerous. All of them are closed to the public in one way or another.