The Explorers

Welcome to a world of secret graves, mysterious death ships, newly discovered skeletons, missing fortresses, and lost Long Ships. In this series, leading archaeologist Tim Sutherland travels to Scandinavia, Estonia, Britain and beyond to get new insights into the world of those they called the North Men: the Vikings. What can analysis of unearthed Viking skeletons reveal? What is the truth about the infamous raids on places such as the Holy Island of Lindesfarne? What can we discover about the Viking way of life and death? What can we learn from recently discovered weapons, artefacts and long-buried Long Ships? With the help of specially filmed reconstructions and recreations and new graphic illustrations, Tim's travels see him meet a host of experts and historians, who guide him through the latest findings and theories and explain just how the Viking world continues to give up its secrets.

This episode focuses on the deep roots of Native America. It is an adventure of discovery started by a stunning discovery in a lost city of the American southwest - evidence that its ancient residents drank chocolate, grown thousands of kilometres to the south in the jungles of Mexico. This sparks a bold new question - could native people across the Americas have been part of a single interconnected world?

Vladimir Putin returns to power under a storm after a four-year absence, but his attempts to improve his popularity are hobbled by accusations of corruption.