Top left: © Adam Dean / ​ Panos Pictures; top center: © Matthew Aslett / ​ Demotix / ​ CORBIS; top right: © David Turnley / ​ CORBIS
Top left: © Adam Dean / ​ Panos Pictures; top center: © Matthew Aslett / ​ Demotix / ​ CORBIS; top right: © David Turnley / CORBIS