In the muddy market square of Momostenango, Guatemala, where shamans burn offerings in the shadow of the Catholic church, prehispanic gods dance beside horror movie monsters and dictators from the dark days of the Cold War. Unlike the folkloric performances long studied by anthropologists, this new dance won't show up on any postcard. In some villages, it's even been banned for frightening tourists. So how did these fiberglass masks of... see more