The Big Southern Butte rises over 2,500 ft. above eastern Idaho’s Snake River Plain. At only 300,000 years old, it’s one of the youngest and largest formations of its kind in the world. The challenging trail to the summit ends in an unparalleled 360 degree view of the plain and distant mountain ranges. Near Craters of the Moon National Monument, visiting Big Southern Butte is easiest from mid-May through October – depending on snow conditions, so there’s still time to book your visit. Photo by Bureau of Land Management.