A lark in the park

Isabel Conway visits Colorado to be thrilled by the dizzying vistas of the 50,000-acre Mesa Verde national park

‘Never, ever lock your knees, that’s very dangerous on these steps,” the ranger guide warns. “Always bend them, and above all don’t freak out.” She’s mighty stern-looking. Our gasps are put down to shortness of breath at being more than 7,000 feet (2,135 metres) above sea level while we ...