Cave 338 is located at 7,332 feet (2,235 meters) above sea level in the Núria Valley (Queralbs, Ripollès). IPHES-CERCA Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Life at high altitudes is unforgiving. The thin air and atmosphere make breathing and other bodily functions difficult—especially for humans. However, a cave over 7,000 feet above sea level in the Pyrenees Mountains between France and Spain is forcing archaeologists to rethink how often our prehistoric ancestors made use of these heights.  A team found a cave in Spain full of hearths, jewelry, and human remains, indicating that people may have been living at this incredibly high altitude as long as 5,500 years ago. A child’s finger bone and a baby tooth discovered among the rock also means this cave may have been a burial site. The cave and its findings are detailed in a study published today in the journal Frontiers in Environmental Archaeology .…