Most of the film was set in Istanbul, Turkey. Locations included the Basilica Cistern, Hagia Sophia and the Sirkeci railway station, which also was used for the Belgrade and Zagreb railway stations. The MI6 office in London, SPECTRE Island, the Venice hotel and the interior scenes of the Orient Express were filmed at Pinewood Studios with some footage of the train. In the film, the train journey was set in Eastern Europe. The journey and the truck ride were shot in Argyll, Scotland and Switzerland. The end scenes for the film were shot in Venice. However, to qualify for the British film funding of the time, at least 70 percent of the film had to have been filmed in Great Britain or the Commonwealth. The Gypsy camp was also to be filmed in an actual camp in Topkapi, but was actually shot in a replica of it in Pinewood. The scene with rats (after the theft of the Lektor) was shot in Spain, as Britain did not allow filming with wild rats, and an attempt to film white rats painted in cocoa in Turkey did not work. Principal photography began on 1 April 1963, and wrapped on 23 August. Ian Fleming spent a week in the Istanbul shoot, supervising production and touring the city with the producers.