There is a Flight 93 Memorial in Union City, CA. It's kind of in a random spot ... just at an empty lot at the corner by a bike path. We used to walk by it every day on our walks and we watched it get built. Each passenger on the plane has a stone on a pathway. There are three stones at the beginning of the pathway describing the memorial. At the end of the memorial is a flag that is surrounded by tiles painted by local elementary school students.