Tonight on Extension 720: The Inca, Maya, Olmec and Aztec—the four great pre-Columbian peoples of South and Central America—created great civilizations with sciences, religion and architecture all their own. Tonight we will journey to Tenochtitlan, Machu Picchu and beyond with two experts in these ancient civilizations. Our guests include GARY FEINMAN, curator of anthropology at the Field Museum, which is currently playing host to the exhibit Machu Picchu: Unveiling the Mystery of the Incas, and BRIAN BAUER, professor of anthropology at the University of Illinois at Chicago.

More information on this and other programs is available at our monthly program guide. You can listen to the show from 9 to 11 p.m. central time here.