As a teen/young adult I rode in a barn that was a complete rectangle. The two long sides had the stalls and aisles, one short side had an enormous wash stall/office area/storage and a room with floor to ceiling windows that looked out on the courtyard. The other short side was essentially an enclosed walkway to get between the two sections of stalls.
This left a large courtyard with one side being a solid wall, two sides having walls with a few rows of windows and some doors, and the fourth side being the floor to ceiling windows.
We would use the courtyard as a grass ring at times, as there was no real ring and it was about the flattest confined place available. There were a few trees in there near the edges and closer to the window wall end, so we only used the part nearest the solid wall for riding. We also turned out in there sometimes, but only when we were in the barn to supervise. Horses turned out in there had to first be introduced to their reflection in the huge window wall.