By far the most popular tourist activity in Potosí is a visit to the mines of Cerro Rico. They're still active, so a tour entails walking past soot-covered miners hard at work in conditions that could be straight out of the 18th century. We weren't especially excited about taking a tour, since gawking at people working in such a dangerous profession is more than a bit unseemly. Between accidents and the inevitable lung diseases, it's still rare for a Potosí miner to reach the age of 50. But we couldn't skip out on the city's most famous experience.