In 1885, rancher and miner Absalom Lehman discovered this underground wonder—a single limestone and marble cavern ¼-mile long. Inside, stalactites, stalagmites, helictites, flowstone, popcorn, and other bizarre mineral formations cover almost every surface. Lehman Caves is one of the best places to see rare shield formations, created when calcite-rich water is forced from tiny cracks in a cave wall, ceiling, or floor. Year-round the cave maintains a constant, damp temperature of 50°F, so wear a light jacket and nonskid shoes when you take the tour. Go for the full 90-minute tour if you have time; it's offered four or five times per day, as is the 60-minute tour. Children under age 5 are not allowed on the 90-minute tours; those under 16 must be accompanied by an adult. Take the 0.3-mile Mountain View Nature Trail beforehand to see the original cave entrance and Rhodes Cabin, where black-and-white photographs of the park's earlier days line the walls.
Lehman Caves Visitor Center, Great Basin National Park, Nevada, 89311, United States