US Department of the Interior @Interior
Big Southern Butte is one of the largest volcanic domes in the world but, at 300,000 years old, it is also one of the youngest. Hikers who trek to the 7,550-foot-high summit are rewarded with spectacular panoramic views of Idaho. Photo by Devin Englestead / @BLMIdaho https://t.co/H8bZAJLx0R — PolitiTweet.org