Revelers and bullfighters test their agility and bravery in Pamplona

 A small city like Pamplona, in northern Spain, is transformed every July 6 with locals and visitors converging for the San Fermin running of the bulls festival. Even 20 years after he first started covering it for AP, photographer Alvaro Barrientos feels the same sense of anticipation the eve before the “Chupinazo” rocket kick-starts the festival.