 The landscape exteriors were shot in the Italian Dolomites (Lago di Pontesei and Cortina d'Ampezzo locality Fiames) and the rest was shot at Pinewood Studios outside London.Betty Box says three of the cast brought their wives on location to Italy – Michael Craig, Stanley Baker and Sid James – and all three were pregnant.Box later wrote that the film "was released during one of Britain's worst flu epidemics – Asian flu – which didn't help at the box office" but that "overseas the movie was successful.