Most of these early claims have now been rendered invalid by the discovery of the bodies of three children at the 6,739 m (22,110 ft) summit of Llullaillaco in South America: Inca sacrifices dated to around AD 1500. There is no direct evidence that the Incas reached higher points, but the discovery of the skeleton of a guanaco on the summit ridge of Aconcagua (6,962 m, 22,841 ft) suggests that they also climbed on that mountain, and the possibility of Pre-Columbian ascents of South America's highest peak cannot be ruled out.