SMITHSONIAN INSTITUTION

Journey into the skin of the earth and explore the amazing world of soil in this exciting new exhibit. Visitors will discover the amazing connections between soils and everyday life, and think about this hidden world in a whole new way.Handmade by ancient Aztecs? The work of supernatural powers? Or carefully crafted fakes? After decades of mystery, the real nature of crystal skulls is finally clear, thanks to scientists using modern technology to determine how they were made.