What are the principal filming locations of the vikings 1958?

The provided evidence only contains details about the 1958 film Vertigo, including its filming locations in San Francisco, Mission San Juan Bautista, Big Basin Redwoods State Park, Cypress Point on 17-Mile Drive, and Paramount Studios in Hollywood. There is no documented information in the supplied source about the filming locations for The Vikings, a different 1958 production. Therefore, based on the verified evidence, the principal filming locations for The Vikings cannot be confirmed.