Question: Where was the Grand Prix held in 1964 where the winner was John Surtees?

Context paragraphs:
1960 British Grand Prix: The 1960 British Grand Prix was a Formula One motor race held at the Silverstone Circuit, Northamptonshire, England, on 16 July 1960.  It was race 7 of 10 in the 1960 World Championship of Drivers and race 6 of 9 in the 1960 International Cup for Formula One Manufacturers.  The race was won by reigning World Champion Jack Brabham and Innes Ireland finished in third place.  Between the two, multiple motorcycle Grand Prix World Champion John Surtees (in only his second ever Formula One Grand Prix) took second place.

1970 International Gold Cup: The 1970 International Gold Cup was a non-championship Formula One race held at Oulton Park on 22 August 1970.  The race was open to Formula One and Formula 5000 cars.  It was run in two heats of 20 laps, with the winner decided on aggregate times.  The starting grid for Heat 1 was decided by a qualifying session, in which John Surtees won pole position.  The grid for Heat 2 was decided by the finishing order of Heat 1.  John Surtees won Heat 1 and overall, narrowly beating Heat 2 winner Jochen Rindt, with Howden Ganley posting the best aggregate result of the Formula 5000 entrants.  Jackie Stewart, debuting the brand-new Tyrrell 001, set fastest lap.

1964 German Grand Prix: The 1964 German Grand Prix was a Formula One motor race held at Nürburgring on 2 August 1964.  It was race 6 of 10 in both the 1964 World Championship of Drivers and the 1964 International Cup for Formula One Manufacturers.  The 15-lap race was won by Ferrari driver John Surtees after he started from pole position.  Graham Hill finished second for the BRM team and Surtees's teammate Lorenzo Bandini came in third.

John Surtees: John Surtees, {'1': ", '2': ", '3': ", '4': "} (11 February 1934 – 10 March 2017) was an English Grand Prix motorcycle road racer and Formula One driver.  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.  He founded the Surtees Racing Organisation team that competed as a constructor in Formula One, Formula 2 and Formula 5000 from 1970 to 1978.  He was also the ambassador of the Racing Steps Foundation.

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.  The race was run over 40 laps of the circuit, reduced from the original race distance of 56 laps due to bad weather, after lobbying from Jo Bonnier on behalf of the GPDA.  The race was won easily by British driver John Surtees in a Ferrari 158.

Reg Parnell Racing: Reg Parnell Racing was a privateer Formula One team during the 1950s and 1960s.  The team was founded by ex-Formula One driver Reg Parnell after he retired from racing.  It raced as Yeoman Credit Racing in 1960 and 1961 and as the Bowmaker Racing Team in 1962.  The team's best results were a pair of second places in the British Grand Prix and the German Grand Prix of .  John Surtees also took pole for the team at the 1962 Dutch Grand Prix.

1925 Belgian Grand Prix: The 1925 Belgian Grand Prix was a Grand Prix motor race held at Spa-Francorchamps on 28 June 1925.  This was the first ever grand prix held at Spa, and the first ever Belgian Grand Prix.

2012 European Grand Prix: The 2012 European Grand Prix (formally, the 2012 Formula 1 Grand Prix of Europe) was a Formula One motor race that was held at the Valencia Street Circuit in Valencia, Spain on 24 June 2012.  It was the eighth round of the 2012 championship season, and the final time the circuit hosted the European Grand Prix.  It was Fernando Alonso's second Grand Prix win in Spain after the 2006 Spanish Grand Prix held at Barcelona.  Michael Schumacher finished third at the age of 43 years and 173 days, the oldest to climb to the podium since Jack Brabham's second-place finish at the 1970 British Grand Prix.  It was Schumacher's best result since his comeback in 2010 and the final podium finish of his Formula One career.

1964 United States Grand Prix: The 1964 United States Grand Prix was a Formula One motor race held on October 4, 1964, at the Watkins Glen Grand Prix Race Course in Watkins Glen, New York.  It was race 9 of 10 in both the 1964 World Championship of Drivers and the 1964 International Cup for Formula One Manufacturers.  The 110-lap race was won by BRM driver Graham Hill after he started from fourth position.  John Surtees finished second for the Ferrari team and Brabham driver Jo Siffert came in third.

1967 South African Grand Prix: The 1967 South African Grand Prix, formally the 1st AA Grand Prix of South Africa (Afrikaans: "Eerste AA Suid-Afrikaanse Grand Prix"), was a Formula One motor race held at Kyalami on 2 January 1967.  It was race 1 of 11 in both the 1967 World Championship of Drivers and the 1967 International Cup for Formula One Manufacturers.  The 80-lap race was won by Cooper driver Pedro Rodríguez after he started from fourth position.  John Love finished second in a privately-entered Cooper and Honda driver John Surtees came in third.

Supporting paragraphs: 1964 Syracuse Grand Prix John Surtees
Answer: Syracuse Circuit, Sicily