After taking up riding to cope with tragedy, Mirtha Munoz has scaled the peak of extreme cycling Bolivia's "Death Road" might seem an odd place for a septuagenarian on two wheels. The world's most dangerous road spirals skyward nearly 3,300 metres, from the country's lowland jungles to the snow-capped peaks of the Andes. Fog, rain, rockslides and sheer cliffs are main attractions. The road has likely claimed thousands of lives.