The movie "10,000 BC" 2008

Young mammoth hunter D'Leh (Steven Strait) and his girlfriend Evolet (Camilla Belle) live quietly in a prehistoric valley lost in the mountains. One day, a group of mysterious warriors attack their tribe and kidnap Evolet. D'Leh gathers a small group of hunters and sets off in pursuit of the warriors to rescue his beloved. On their way, they cross unknown lands and discover human civilizations whose existence they had been unaware of until then. At each stop they are joined by a tribe that, like theirs, had been attacked by slave hunters. Thus, D'Leh's small group gradually turns into a real army. Their journey is fraught with many dangers, as our heroes must face prehistoric monsters and terrifying natural phenomena, and at the end of it they discover a realm beyond their imagination.