ExplorerLevisonWood–famousforWalkingtheNile,WalkingtheHimalayasandWalkingtheAmericas–istakingonanewexpeditioninthisfour-partseries:tocrossthemightyCaucususmountainrangethatliesbetweenRussiaandIran.Andaswellasanewregionoftheworld,Levisonistakinganewapproac