So integral to New York’s cultural landscape and physical infrastructure, if the Nazis had their way during the War Grand Central Station would not be standing today. Throughout World War II millions of servicemen would pass through the hub on their way to and from the war front, which made it a prime target for bombing. In fact, in 1942 four German spies had plans to destroy Grand Central Station but were quickly apprehended.
As the History Channel points out, though, if they were able to reach the secret subbasement, M42, they would have likely wanted to make a quick turn around: a platoon of armed soldiers, all of whom monitored the secret outpost. So secret is the subbasement that it has never appeared on any Grand Central Station map. What’s behind its doors? The controls of New York’s transportation network.