Two centuries-old puzzles anchor this History Hit compilation: the search for Vilcabamba, the jungle refuge where the last Inca rulers held out against the Conquistadors after Cusco fell, and the persistent legend of Yamashita's gold, the fortune supposedly hidden by retreating Japanese forces at the end of the Second World War. Historians and archaeologists walk the actual sites, from Andean ruins reclaimed by forest to the tunnels and caves rumored to hide wartime loot, weighing documentary evidence against decades of treasure-hunting folklore. Expert interviews sit alongside location footage and maps that trace expeditions step by step, showing how each mystery has been chased, half-solved, and argued over by generations of researchers. Rather than delivering tidy answers, the film lays out competing theories and the physical evidence for each, letting viewers see how conclusions get built from fragments: a colonial account here, a looted artifact there, a soldier's testimony decades later. It is less a single narrative than a set of case files, presented by people who have spent careers trying to close them.