Uncovering lost antiquities is one of those topics that fascinates most of us, especially when they’re documented as the discoveries are made. This is one of the goals behind the Netflix “Unknown” documentary film series in its chronicles of such events around the world. In the series’ latest installment, filmmaker Max Salomon follows the efforts of Egyptologist Zahi Hawass and his colleagues as they seek to find the lost pyramid of Pharoah Huni, a little-known monarch of Egypt’s Old Kingdom, in the necropolis of Saqqara. The structure, believed to be located in an area of the ancient city that...