As its very name implies, Death Valley is a dangerous place. The largest national park in the continental US, its 3.4 million acres cover extremes of geography and climate: the Badwater Basin salt flats at 282ft below sea level, Telescope Peak at 11,000ft high, temperatures that can reach 120F. Many visitors retreat quickly to the relief of an air conditioned car or hotel room. But not Ulrich. The 64-year-old athlete and ultramarathoner has run more than 4,000 miles in and around Death Valley National Park.