Mysterious Ice Age structure made from hundreds of mammoth bones discovered in Russia

Around 25,000 years ago, hunter-gatherers used the bones from 60 mammoths to build a large circular structure in Russia.

And no one knows why.

Researchers have excavated the site in an attempt to understand it, but they don't know why the structure was built, according to a new study.

This isn't the first "mammoth house" to be found in Russia, but it is the oldest and largest, measuring 41 feet across.

In the 1960s and '70s, researchers found similar, smaller buildings at the site, which they dubbed Kostenki 11. It's 310 miles south of Moscow and now home to a museum, the State Archaeological Museum-Reserve Kostenki.

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