An urban map of the largest cities in the world, by population, in the early 1700s looked almost empty by today's standards.
Prime Minister Narendra Modi on Thursday visited the Xi'an City Wall which is the oldest and the largest surviving wall of its kind in China and was given a traditional Tang dynasty welcome at the historic site.
As the sprinter runs his last race, we veer off the trodden tourist trail in Jamaica and revisit his hometown, Trelawny Parish.
