I am going to visit US South West in May 2013.
My route-planing is almost done. I gonna see many nature attractions and big cities. I just like to add some technical attractions too (like technical museums, airplane factories where visitors are allowed to go in, etc). I have got only 2 technical attractions now: Hoover Dam and airplane graveyard in Tucson. It also should be nearby my planned route: http://goo.gl/maps/tO4zR