On Nov. 5, 1913, William Mulholland threw the switch that brought millions of gallons of clear mountain water coursing into Los Angeles through a 233-mile aqueduct, the world's longest at the time. It was a scene worthy of Cecil B. DeMille, but the soon-to-be famous filmmaker had only just set up shop in a barn at Selma and Vine. Although Hollywood as we know it did not yet exist to capture this very Hollywood moment, Mulholland rose to the occasion with a speech so apt no screenwriter could have topped it. "There it is: Take it!" he said, and that's what the city of Los Angeles did, as its population doubled, and then doubled again before the end of the 1920's. How best to apreciate Mulholland's impact on this sprawling metropolis? Take in the views from the drive that bears his name as it winds above Hollywood and Beverly Hills through the Santa Monica Mountains, past spectacular homes, lush gardens, and crystal-blue pools that Mulholland's water made possible.