Author 'Hiedra98' (Id 90011 ) : Potosi is the highest city in the world 4. 100 m on the Altiplano in Bolivia and was the largest and richest in America at the time of the Conquistadors. It was built in 1545 at the foot of Cerro Rico - the mountain wealthy - and 40. 000 tons of silver were extracted from this geological phenomenon. In 300 years, millions of Indians (6 to 8 according to historians) were sacrificed on the altar of white gold for the glory of the king of Spain.