jaw-dropping example of Ice Age architecture has been unearthed on Russia’s forest steppe: a huge, circular structure built with the bones of at least 60 woolly mammoths. But exactly why hunter-gatherers enduring the frigid realities of life 25,000 years ago would construct the 40-foot diameter building is a fascinating question.

“Clearly a lot of time and effort went into building this structure so it was obviously important to the people that made it for some reason,” says Alexander Pryor, an archaeologist at the University of Exeter (U.K.). He is the lead author of a new study published this week in the journal Antiquity describing the find at Kostenki, a place where many important Paleolithic sites lie clustered around the Don River.

The ancient builders did leave some clues. Fires once burned within the structure and food scraps, including vegetables, remain. Several pits containing mammoth bones lie just outside of the bone circle and may suggest food storage. “You obviously get a lot of meat from a mammoth,” Pryor said, “so the idea that there were food processing and food storage activities going on at the site is something that we want to investigate more.”

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To some, though, the grandeur of the structure suggests more than practical significance. “People have also speculated a lot about a likely ritual element to this and it’s really hard to say what that might have been,” Pryor adds. “Ritual is embedded in human lives in all sorts of ways. The fact they might have designed a structure of this type as part of both their ritual and their sustenance activities is very reasonable”.

Read more: smithsonianmag