Four thousand years separate us from the builders of Egypt's pyramids, and this Naked Science episode works through the physical evidence they left behind to answer four questions: how the structures went up, who did the labor, why they were built at all, and what might still be sealed inside them. The film examines the Giza plateau's worker villages, unearthed by archaeologists as proof the builders were paid laborers rather than slaves, and looks at quarrying and transport methods for stones weighing several tons apiece. Engineers and Egyptologists walk through competing theories for the ramps and levers that raised the blocks, while the religious purpose of the pyramids as tombs meant to secure a pharaoh's passage to the afterlife gets laid out through inscriptions and burial chamber design. Interior shafts and unexplored chambers, still debated by researchers today, close out the film as an open question rather than a solved one. Straightforward narration and site footage carry the case from stone to conclusion.