This famous silver mining city is one of the highest cities in the world. The mining tour will give you a great insight into the reality that these miners live on a daily basis. Although it is reminiscent of a wild western movie, the low temperatures will remind you otherwise. The city was the royal mint for the Spanish conquistadores back in the day and the nearby Cerro Rico or "rich mountain" was said actually to be made of silver! It is after all the world's largest deposit of silver. However, mining in the area later became more concentrated on tin mining.