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The film opens with a montage of scenic views of the Greek Islands, which ends with an undersea shot off the island of Hydra. According to a May 1955 Hollywood Reporter news item, Alec Coppel was initially signed to write a screenplay for this film. By November 1955, a Daily Variety news item noted that Leon Uris was to write the screenplay, which Henry Koster would direct. The extent of Coppel's and Uris' contribution to the completed script has not been determined, however. Although an October 1956 Hollywood Reporter news item places Antonio Ciarramela and Paris Pappis in the cast, their appearance in the released film has not been confirmed.
According to materials contained in the Charles G. Clarke Collection at the AMPAS Library, location shooting for the film took place on the Greek islands of Mykonos, Rhodes, Delos and Sonterrini. Other locations included the Parthenon and the Amphitheatre in Athens, Delphi, Corinth and the Meteora Monastery. Interiors were shot at the Cinecitt Studios in Rome. The Clarke Collection adds that the film was produced using funds frozen by the Italian government. According to a May 1957 article in American Cinematographer, filming began at Hydra, where two Greek landing barges were hired to transport the cameras and generators. The studio planned to shoot the picture in 55 millimeter until it decided that it would prove too difficult to transport the bulky equipment through the rugged terrain.
This picture marked Sophia Loren's American screen debut and was the initial production of her four-picture deal with Fox. Director Jean Negulesco, cameraman Milton Krasner and actor Clifton Webb had worked together previously in Rome on the 1954 film Three Coins in the Fountain (see below).