Although most of it was filmed overseas, some key shots of Star Wars were filmed in Death Valley. Not surprisingly, the filming locations were intended to represent Luke's home planet, Tatooine. When Return of the Jedi was made, the crew returned to the famous national park. A self-guided walking tour (with pictures!) can be found at this site.
A more complete list of the many films shot at Death Valley can be found on the nps.gov website.
