MT. VERNON — — The Mt. Vernon Jaycees House of Horror threw open its doors Friday to begin the scare season. The House of Horror is being held at the old train depot at Broadway and First Street and opens at 7:30 p.m. tonight, Oct. 19-20, Oct. 26-27 and Halloween. The haunted house will stay open until everyone has gone through. Tickets are $7 at the door.