The Gilder Lehrman Institute of American History is one of the great repositories of information about American history and culture. The Americas to 1620 exhibit, featured here, explores the world of North America, beginning with the settlements that began between 20,000 BCE and 9,500 BCE. From there, readers may use the interactive timeline to learn about the Hopewell Culture, which flourished in east-central North America between 200 BCE and AD 500, the great Hohokam and Anasazi cultures of the southwest, the Mississippian Culture that flourished through the 1500s, or the Aztecs in the Valley of Mexico, among others. In addition to an excellent timeline, readers will find pithy explanations of lands and peoples, and wonderfully evocative visual images that bring to life the pre-European history of the Americas.