Built in 1913, Grand Central Terminal, in New York City, is the largest train station in the world, in terms of number of platforms. Therefore, it’s only natural that there be various hidden nooks, corners and spaces, such as the network of underground tracks, storage areas and tunnels. Weaved amidst them all is an unlisted train platform, known as Track 61, with a secret entrance and passageway leading to an elevator going straight up to the world-famous Waldorf-Astoria hotel.