Edited sentence: Close to the airbsae, theur was huge abondoned house complex built and used by the United States military, The air force base was renamed to April Air Force Base, since the producers couldn't use the name March Air Force Base.One of the shot in the April Air Force Base was shot at a sound stage in Los Angeles.The X-Files crew had buildt two permanent stages, when shooting season seven of the show.The first scene was shot in Griffith Park, above the play ground for children.The first scene with the Walk-ins rising up from their grave, was a "tricky" seen according to director Kim Manners.The scene at April Air Force Base was shot in San Bernadino, California at a closed airfield.The scene at the restaurant, was shot in a location on Sepulveda Boulevard, at a hotel that had been standing their for 30-40 years.The stages were five and six at 20th Century Fox, and they used stage eight as their "swing set".To get the kinds into the graves, they told them that the graves were actually forts, saying that the kids wouldn't collaborate if they told them to lay themself in a grave