The Story of William Tell is an unfinished film about William Tell. It starred and was produced by Errol Flynn. It commenced filming in Italy in 1953 and was meant to be the directorial debut of Jack Cardiff. It was filmed in Cinemascope. A 10,000 model town set was built near Mont Blanc.
Had the film been completed on time it would have been the first independent movie filmed in CinemaScope.
Source: Wikipedia