Potosi, Bolivia
Potosi was at one stage Latin America's largest and wealthiest city due to possessing the worlds richest mine at the time. It is also the worlds highest city at a little over 4,000m. To mine the nearby hills the Spanish conscripted labor from indigenous and imported African slaves. They were set to build a huge system of dams to help in the processing of the minerals and to work the mines themselves (the African slaves proved to be pretty useless at 4,000m and...