Temple of the Moon at Machu Picchu

This guide to the Temple of the Moon at Machu Picchu traces a strange gap in the record: Hiram Bingham found the citadel above in 1911, but this cave on the far side of Huayna Picchu wasn't uncovered until 1936. Inside, it describes a stepped altar, six trapezoidal niches and a polished stone throne that guides say once held a mummified ruler. It also weighs the competing guesses for why the chamber carries the moon's name at all, when nothing carved here points to one.