Ten unresolved puzzles from the ancient world get individual treatment here, from the standing stones of Stonehenge and the sunken myth of Atlantis to the geometric lines etched into the Nazca desert. The film moves site to site, pairing narration with location footage and expert commentary to lay out competing explanations rather than settling on one. Alexander the Great's sudden death gets examined alongside the theories that have followed it for over two thousand years, poison, illness, and political murder among them. The Knights Templar's disappearance and the persistent claims linking ancient monuments to visitors from beyond Earth both get airtime, treated as historical questions rather than settled fact. Produced by History Hit, the documentary favors breadth over depth, giving each mystery enough time to lay out the evidence and the leading theories before moving to the next. It works best as a survey for viewers wanting a tour of archaeology's open questions rather than a deep examination of any single one.