Hundreds of Haitian migrants trek through Colombia's Darien Gap jungle, crossing river streams and ascending swampy roads. They are heading for the border with Panama, with dreams of a better life in the United States. The Darien Gap -- a 1,430,000-acre (575,000-hectare) jungle is one of the world's most dangerous routes, according to UNICEF. It is infested with armed gangs and drug traffickers who often rob or attack the migrants crossing it. IMAGES