Colombia Acclaimed anthropologist and explorer Wade Davis makes a remarkable journey into the heart of war-torn Colombia to visit one of the indigenous groups that call themselves the Elder Brothers. These extraordinary people claim to be the last descendants of a once-great civilization, the Tairona, and to speak with their voice. Could they be the last window we have on the great high civilizations of the ancient Americas? -- Amazon. National Geographic ventures into the rain forest with Wade Davis for an up-close look at the Barasana river people, a group believed to be the descendents of the legendary "lost" Amazonians. Davis embarks on a symbolic journey that will honor the group's ancestors and witnesses the rituals that demonstrate respect for this tropical landscape.