Mina El Eden was one of Mexico’s richest mines from 1586 to the 1960s. It shows how money was made and what a terrible price was paid for it. Indigenous people who were forced to work as slaves dug for silver, gold, iron, copper, and zinc in horrible conditions. Up to five people died every day because of accidents, silicosis, or tuberculosis. Today, things are a bit different. To get inside Cerro del Grillo, you take a small train, and guides lead you along well-lit paths past shafts and over underground pools. Image by Ted McGrath.