6. There are Glass Walkways in the Windows of Grand Central Terminal

Inside the iconic arched windows of Grand Central Terminal’s main concourse, there are glass cinderblock walkways that go through the windows. If you look closely at the above photo, you’ll see someone crossing right between the first zero in 100. The walkways connect the offices above Grand Central so that employees don’t have to walk through the busy terminal.

The walkways are strictly off limits to the public and required special access for entry. Untapped New York had the chance to go inside once! You can read more about the walkways and check out our photos from inside here.