Classified as World Heritage by Unesco, Potosi is as fascinating as it is bitterly cold (13,120ft high). This imperial town that was founded in the 16th century is quite calm, with its old straight paved streets. The major sites are located around the Main Square. As well as being interesting for its baroque style, the Casa de la Moneda has masks, colonial paintings, and a collection of coins minted in the town for Old Europe. There are still some thirty churches and colonial convents such as that of Santa Teresa. The San Lorenzo church is a masterpiece of baroque art. You have to stroll in the district of Kantumarka to admire the town's oldest colonial houses and their amazing balconies. On departure from Potosi, go and see the sanctuary of Manquiri (end of the 18th century), which was whitewashed. In May, the town faithful make the 21.7 miles on foot to celebrate their patron saint's day. At the entrance to Potosi, the Cerro Ricco mines that are still active were previously the wealth of the country and the Spaniards. Today, the backbreaking work and the miner's living conditions bear witness to the extreme precarity of this country and this area in particular.