The youngest volcano in Arizona — a thousand-foot cinder cone north of Flagstaff that built itself in a single eruption around the year 1085. The cone is jet-black at the base and oxidized rust-red along the rim, where John Wesley Powell named it Sunset Crater in 1885. It is the centerpiece of Sunset Crater Volcano National Monument, set aside in 1930. The Bonito Lava Flow at its foot still looks fresh, eight centuries on.