Archaeologists in Russia have discovered a campsite of Upper Paleolithic hunters. Kostenki 11 is the site of one of the oldest remaining structures from the ice age. It’s material: Mammoth bones. The round structure has dozens of jaw bones and skulls. There are also bones from horses, bears, wolves, reindeer, red foxes, and arctic foxes. While harsh conditions caused most people to leave this area, prehistoric humans at Kostenki 11 found ways to burn wood, gather plants, and hunt.