Venezuela The Longest Trek

In this Aug. 31, 2018 photo, Venezuelans illegally cross into Colombia, to Villa del Rosario, along a path known as a "trocha." Uncontrolled by Venezuelan or Colombian authorities, the trochas are ruled by bands of armed men sporting rifles and dressed in fatigues. They charge migrants about $10 to be let through, frequently robbing or assaulting those who can't pay. (AP Photo/Ariana Cubillos)