There’s a ton of Nevada to explore from mountaintops to riverbeds but if you want to see the entire state, you’ll have to seek what’s beneath the surface. One of the most decorated caves in the country, Lehman Caves in Great Basin National Park extends underground approximately two miles from the natural entrance. The formations here include stalactites, stalagmites, columns, flowstone, something called cave popcorn, and the apparently quite rare ‘shield’ formations that visitors can explore on underground walking tours.