The historic industrial site of Pulacayo is located in the PotosÃÂ Department of Bolivia. The mining center developed around Huanchaca, the world's second largest silver mine, and was founded in 1833. Features of the mining center include: <blockquote>
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Pulacayo also contains a train that Butch Cassidy and the Sundance Kid robbed.
This site was added to the UNESCO World Heritage Tentative List on July 1, 2003, in the Cultural category.
Pulacayo, Industrial Heritage Site - UNESCO World Heritage Centre Retrieved 2009-03-18.