Subterranean New York City

Map of the New York City Subway and PATH systems
The City Hall subway station in Manhattan has been closed to the public since 1945.
Operated by the Port Authority of New York and New Jersey, the Holland Tunnel is a vehicular tunnel that travels under the Hudson River, connecting Lower Manhattan to Jersey City. The tunnel was the world's first mechanically ventilated tunnel.

Subterranean New York City relates to the area beneath the surface level of New York City; the natural features, man-made structures, spaces, objects, and cultural creation and experience. Like other subterranea, the underground world of New York City has been the basis of TV series, documentaries, artwork, and books.