NEW YORK, NY - DECEMBER 09: Prince William, Duke of Cambridge visits the observation deck of the Empire State Building on December 09, 2014 in New York City. The prince and his wife CAtherine, Duchess of Cambridge, who are traveling without their son Prince George, are on a three-day US east coast visit. This is the Duke and Duchess' first official visit to New York City. (Photo by Paul Edwards - Pool/Getty Images)