Exactly 51 years ago today, in 1964, #carnegiehall became a Registered #NationalHistoricLandmark. Pictured viewing the dedication plaque are Isaac Stern, President of the Carnegie Hall Corporation, Frederick W. Richmond, Chairman of the Board, Robert F. Wagner, Mayor of the City of New York, and Stewart Udall, United States Secretary of the Interior. #CHarchives #CHtreasures