<P> Annabelle walks to the basement to confirm her husband is dead . A skeleton rises from the acid, accuses her in Loren's voice, and shoves her into the vat . Loren emerges from the shadows, holding the contraption that he used to manipulate the skeleton, now revealed to belong to Trent . </P> <P> Manning tells the other guests that she shot Loren . When they arrive, Loren explains that he had their guns loaded with blanks, that Trent and his wife plotted to kill him, and that they both met their end in the vat of acid, though he lies to conceal the fact that he murdered his wife, claiming she stumbled and fell into the vat . Pritchard remains convinced the house is haunted, with Trent and Mrs. Loren now added to the ranks of its ghosts . </P> <P> While exterior shots of the house were filmed at the historic Frank Lloyd Wright - designed 1924 Ennis House in Los Feliz, California, the bulk of the film was shot on sound stages, depicting the interior of the house in a combination of styles, including 1890s Victorian, with gas chandeliers and sconces . The poster for the film included an illustration of a house in yet a third style, that of a fanciful four - story Romanesque structure . </P> <P> The theatrical trailer promoted the film as The House on Haunted Hill, although all advertising material and the title on the film itself were simply titled House on Haunted Hill . </P>

Where was the original house on haunted hill filmed
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