An unusual prehistoric monument made up of three interlocking circles
labrujulaverde.com
labrujulaverde.com
The article seems to allude to it having some sort of funeral practices
They mention a gravel layer in the ditch which suggests a palisade. I'm not quite sure how they get there (I don't see the actual report), but presumably they have some basis. As a fenced enclosure, it seems to small for livestock, but perhaps a fortified homestead.