Sun Valley oozes history. In 1936, it debuted the world’s first chairlift and became a full-fledged destination resort, drawing visitors like Marilyn Monroe, Ernest Hemingway, and Louis Armstrong. And in 1946, Warren Miller started making ski movies there. Today, Sun Valley’s the home of ski-film stars Zach and Reggie Crist and the premier heli-ski outfitter in Idaho. But the real reason it’s a resort for the ages: Sun Valley’s terrain—ranging from high-speed rippers to wide-open bowls—never gets old.