A Maya ceremonial cave in western Belize, reached through a swim into an hourglass entrance and a long wade upriver in the dark. The chambers hold pottery, jade, and the calcified skeleton of a young person, known to guides as the Crystal Maiden, left a thousand years ago. Cameras have been banned since 2012, after one dropped onto a skull. The cave is reached only with a licensed guide, from a trailhead in the Tapir Mountain reserve.