Here are the former Cinedome Theaters in Orange, CA.  These theaters featured all the latest technologies when they opened in 1969 - 70mm wide-screen projection, 6 track stereophonic sound and curved screens.  In 1992, the year we arrived in CA, they were enlarged to 11 screens and I saw many movies here.  This was one of my favorite theaters.  It closed in 1999 and was demolished the following year. (Source: internet)