The Freedom Tunnel
The Freedom Tunnel is the name given by urban explorers, graffiti artists, and a handful of homeless people to the Amtrak tunnel under Riverside Park in Manhattan, New York City. It is also the name of the legendary and constantly evolving graffiti pieces that cover the tunnel walls.
The Freedom Tunnel got its name because the graffiti artist Chris “Freedom” Pape used the tunnel walls to create some of his most notable artwork. Link.