In this Dec. 16, 2015 photo, Aymara indigenous woman Cecilia Llusco Alana, right, follows her guide as they hike up the Huayna Potosi mountain on the outskirts of El Alto, Bolivia. They started the last piece of their ascent after midnight to take advantage of the hardness of the snow, hoping to reach the top by dawn. (AP Photo/Juan Karita)