A Hidden Valley surrounded by mountains. Red-rock volcanic soils. Mighty oaks and a sparkling lake where quail—and even an occasional coyote—come to call. This is the world of Hansen Vineyards, encompassing 60 gently sloping acres in the eastern hills of the Napa Valley. Part of the Atlas Peak appellation, this is the prime country for Cabernet sauvignon, with stony, well-drained soils and sunny, moderate temperatures that bring out the best in grapes.