Construction

Hector Salazar, left, and Gerardo Zambrano position another 477-pound granite panel on the History of Humanity monument. The founder of the desert museum, Jaques-Andre Istel, says the monuments are engineered to last 4,000 years. "Only time will tell," he admits.

( Don Bartletti / Los Angeles Times )

Hector Salazar, left, and Gerardo Zambrano position another 477-pound granite panel on the History of Humanity monument. The founder of the desert museum, Jaques-Andre Istel, says the monuments are engineered to last 4,000 years. "Only time will tell," he admits.

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