Potosi Mountain, a limestone peak in southern Nevada’s Spring Mountains about 30 miles southwest of Las Vegas, has long been important for both culture and industry. In the mid-19th century, a giant cave there was used for vision quests by Chemehuevi shaman, and the mountain later became associated with lead and silver mining after Mormon settlers found rich ore in 1855. It also became the site of a major tragedy when TWA Flight 3 crashed there on January 16, 1942, killing 22 people, including Carole Lombard. Today its prominent height makes it a major broadcast and communications site for the Las Vegas area.