Consuelo Vanderbilt-Costin, the great, great granddaughter of William Vanderbilt II, a developer of the Grand Central Terminal, took Inside Edition on a tour of the secrets inside the iconic building. The famous New York City commuter hub is known for its architecture but also has some hidden features. Above the terminal are catwalks employees use to move around without the congestion of the crowds. Railroad architect Mark Saulnier also explains one of Grand Central's most amusing secrets. #InsideEdition
