Question: Where was it came from outer space filmed?
Disambiguated questions and answers: question: Which soundstages was It Came From Outer Space filmed on?
At which outside locations was It Came From Outer Space filmed at?
answer: Universal's sound stages
Palmdale, CA, Victorville, CA, and the Mojave Desert
Natural Questions answer: Palmdale
Mojave Desert
Universal 's sound stages
Victorville (from the Wikipedia article "It Came from Outer Space")