Lovely campground beside a large natural arch in rural Wyoming. Not only can you pitch your tent with this impressive geological formation as your view, but the North Platte River runs underneath the arch and right up against the campground. There's a short hiking trail that leaves from the campground and brings you up on top of the arch, giving you a better view of the river, an old power plant, and the surrounding red rock.
Campground is free but there's a three day limit. Check in with the campground host/park manager at the office across from the campground to check in. Really friendly folks and well-maintained park overall.