HOLLYWOOD - Alliance Atlantis, Canada's leading TV and movie producer and distributor, is planning to mount an exhibition of costumes, props, still photos and sketches from Lord of the Rings at Toronto's landmark tourist attraction Casa Loma from Oct. 31 through Nov. 11. Alliance Atlantis marketing chief Frank Mendicino told the Canadian website JAM! Showbiz, "To me, the exhibit of props, costumes and designs of the film is very different. I don't think anyone's ever done this before, and I wanted this. I pushed and pushed and I got it. We're the only place in North America having this exhibit." Casa Loma, a lavish, medieval castle that took 300 workers to build between 1911 and 1914, was the onetime residence of Sir Henry Mill Pellatt, who built the first Canadian electric power generating station at Niagara Falls. It was once described by a critic as a mixture of 17th century Scotland and 20th Century Fox.