Farmed from the Paleomythic FB page, some ideas for adventure sites.
First, a travel piece from the Guardian. An interesting location in its own right, near enough to Sherwood Forest for the Robin Hood links, and cave materials 10x older than Stonehenge. Why exactly do your players need access to a ritual site out of deep history?
https://amp.theguardian.com/travel/2...HcCosZAandm3VI
Second, a Welsh castle built above above a cave with archeological finds going back 10K years. What exactly were they defending against? Alternatively, what threat required that deep a redoubt for that long?
https://metro.co.uk/2022/06/17/pembr...vVzSuLy6StVGps
Finally, an offshore cave full of Stone Age art that can only be accessed by SCUBA dive. During its height, sea levels were 135' shallower. It's flooding, and the race is on to document it before its lost forever. If you can't come up with an idea for this site, I cannot help you.
https://phys.org/news/2022-05-unders...2WnMjTcpEoYBu4