Picture the Appalachian Trail in California, or the Camino de Santiago in Spain. Then draw a route through more than 10,000 years of history, covering Neolithic ruins, Biblical sites, one of the New 7 Wonders of the World, and russet landscapes that wouldn't look out of place on Mars. That's the Jordan Trail, and only a slice of it. The 650-kilometer trail takes about 40 days to complete, starting at the northern tip of Jordan in the city of Umm Qais and ending in Aqaba i...