Where was the Grand Prix held in 1964 where the winner was John Surtees?
1964 Syracuse Grand Prix: The 13th Syracuse Grand Prix was a motor race, run to Formula One rules, held on 12 April 1964 at Syracuse Circuit, Sicily. John Surtees:  He was a four-time 500cc motorcycle World Champion – winning that title in 1956, 1958, 1959 and 1960 – the Formula One World Champion in 1964, and remains the only person to have won World Championships on both two and four wheels.
Syracuse Circuit, Sicily