Bagged White Butte while in the Badlands. Only #5 so far. Just kind of decided to do this recently.
This hike was full of birdsong, rustling cottonwoods, and bison. First one or two, then 5 or 6 on the butte itself as I approached, then 60-80 in a herd visible from the top. Oh, and some mud from some of the many Sage Creek crossings.