NY1 VIDEO: "The Road to City Hall" host Errol Louis looked back at the 100 years of Grand Central Terminal with Peg Breen, the president of the New York Landmarks Conservancy; Kenneth Jackson, who is a history professor at Columbia University and the editor of "The Encyclopedia Of New York City"; and The New York Times' Sam Roberts, who is also the host of "New York Times Closeup" on NY1 and the author of the new book, "Grand Central: How A Train Station Transformed America."