Scott Wolter receives a call about alleged Viking artifacts found in the Arizona desert. Using state-of-the-art XRF (X-ray fluorescence) identification technology and insight from a Viking historian, Wolter starts his search in the southwestern desert. From there, new leads take him to California to excavate a supposed buried Viking ship that might have once sailed America’s vast inland sea and to Mexico to examine a petroglyph depicting what could be Viking travelers. The episode produces some unexpected results and opens the door to further expeditions into where the Vikings went and why.