La Rinconada, Peru
Many of the 30,000 Peruvians who call La Rinconada home lack basic educational skills. Most are employed under an ancient lottery system - and verbal contract - called cachorreo, in which they work for 30 days without pay. On the 31st day they receive payment in the form of a sack of ore, which may or may not contain gold. It's a cruel lottery that can lead to indentured servitude.