For those interested in ancient art in the form of carvings and paintings in rock dating past 2000 years old, check out a section of the San Rafael river in Utah known as the Swell. One group of paintings suggests a depiction of human sacrifice. Speculation at best, because very little is known about the inhabitants of the region so long ago. With humanoid depictions suggesting what we recognize as alien beings and horned figures, they leave plenty of room for all manner of guessing. Any ancient art experts here with any additional information?

https://www.summitpost.org/buckhorn-wash-pictographs/237298

https://sanrafaelswellguide.com/petroglyphs-and-pictographs/

https://utahadvjournal.com/index.php/blood-red-rock-art-on-the-san-rafael-swell