The 67 tracks are numbered according to their geographic location in the terminal building rather than the trains' destinations, because all of the trains terminate at Grand Central.
The main concourse boasts a hidden staircase that’s used by Grand Central employees. You can see the brass cylinder that conceals the steel steps in the center of the information booth. Read more.
The constellations on the ceiling are depicted backwards. Although a mistake, the Vanderbilts claimed this was to provide God's view of the stars.
