Mariscal Mine, a historic mercury (quicksilver) mine in Big Bend National Park, Texas. Operated from 1900 to 1943, it was once a major US producer, producing almost a quarter of the nation's mercury. # Why Go 📜 Explore historical mining structures and lodgings. 🏞️ Experience a remote, less-frequented part of Big Bend National Park. 📸 Enjoy expansive views of the West Texas desert and unique photo opportunities of the camouflaged mine and surrounding landscape. 📚 Learn about the challenging history of quicksilver mining and its workers. # Why Avoid ⚠️ Requires four-wheel drive and high-clearance vehicle for access on unpaved roads. ☀️ No shade, bring sun protection. 🚧 Tunnels are barricaded, warning signs for mercury residue and radiation. # Tips 👟 Wear comfortable sneakers for gravel paths. 🚶 Watch your step on the short, gravelly hill. 🗺️ Consider avoiding the dicey Black Gap shortcut.