Archaeologists have long been baffled by a mysterious and powerful tribe that lived at the headwaters of the Amazon 2,000 years ago. Their warriors were feared and their women's beauty was considered exotic and unparalleled. Yet, new evidence finds surprising similarities between this ancient tribe and Spanish Celts and Carthaginian cultures. From their gods, architecture and writings their similarities are uncanny. Could this tribe really have been a colony of the best seafarers of that era on the run from the Roman war machine? Follow the scientists who think it is a distinct possibility. 2014/color/60 min/NR/widescreen.