Headlights, Imperial Sand Dunes, California, 2005 Photograph by Gerd Ludwig Headlights stream up and down the fluid banks of Imperial Sand Dunes, southeast of California's Salton Sea, in this time exposure. An off-roaders' paradise, the dunes were blown from the dry bed of Lake Cahuilla, the sea's ancient ancestor. More than a million fans hit the dunes each year, pumping $54 million into local coffers. The cost? Brawls, fatal crashes, and run-ins with endangered species.