6. There’s a Blocked Off Passageway to Herald Square

The Hilton Passageway gave access for commuters between Penn Station and the N/R/Q and B/D/F/M trains until the 1970s, when it was closed off due to security reasons. It was reputedly narrow and in a state of disrepair. Today, it is simply blocked off by bricks – you can see the original opening by the change in white bricks along the wall.