Running through GST to catch a train won’t give you an appreciation of this amazing building and the important history behind it. Take Untapped Cities “Secrets of Grand Central Terminal” tour to take a slow and considered visit with guides who really know their material. Unfortunately, due to security concerns, the truly secret places can no longer be visited by the general public, but the guides have the photos and the back-stories to give you a flavor of magnitude of the building’s unique and fascinating history and use.