Spring is just around the corner, and spring is a great time to visit Craters of the Moon National Monument and Preserve, between Arco and Carey in Idaho. You'll avoid the heat of summer and you just might catch the season's first wildflowers. Craters of the Moon is the home of many unique native plants, but you won’t have any trouble identifying what’s blooming in those lava fields—because there’s an app for that. The park’s free wildflower app was developed by an Idaho Youth Ranch alumnus.