Researchers found a mysterious ice age structure made from hundreds of mammoth bones in Russia

According to a new study, researchers have found a mysterious ice age structure made from hundreds of mammoth bones in Russia. Nearly 25,000 years ago, hunter-gatherers used the bones from 60 mammoths to build a large circular structure in Russia. Researchers have excavated the site in an attempt to understand it, but they don't know why the structure was built.