Turret Arch is the smallest of the three arches you'll see on the Windows Loop Trail, but it is part of a more intricate, castle-like rock formation that includes a spire (hence the name). There are two holes in this formation, one you can walk through and one high up on the rock face. The views of the north and south Window Arches from inside the Turret Arch are neat. The trail to Turret Arch is a very gentle incline with only a few stairs.