In 1999, near Llullaillaco's 6739 meter summit, an Argentine-Peruvian expedition found the perfectly preserved bodies of three Inca children, sacrificed approximately 500 years earlier, including a 15-year-old girl, nicknamed "La doncella" (the maiden), a seven-year-old boy, and a six-year-old girl, nicknamed "La niña del rayo" (the lightning girl). The latter's nickname reflects the fact that sometime during the 500-years on the summit, the preserved body was struck by lightning, partially burning it and some of the ceremonial artifacts. The three mummies are exhibited in rotating fashion at the Museum of High Altitude Archaeology, specially built for them in Salta, Argentina.