YouTube opened sound stages inside the historic Spruce Goose hangar in Los Angeles that was once home to Howard Hughes' giant wooden airplane. A company called Big Door Stage bought a former apartment building built in 1946 on the fringes of an El Segundo industrial area and turned it into sound stages and production facilities where Google and other businesses film commercials and other productions. And the Netflix film "Rim of the World" relied on a former state mental hospital an hour east of Hollywood in Pomona to create a fight scene involving alien monsters.