I started at the east access point of Avila's wall. Towards the outside, you could see the river, bridges and various buildings, most of which seemed to be commercial. Towards the inside, you saw many houses, some newer, some older, most having terra cotta roofs. There were also many "iconic" types of buildings, the cathedral on the east end of the city being the most visible at all times. As I walked along the north and east walls, there were some buildings that were encorporated into the structure of the wall. It occurred to me that someone brave could potentially leap over the railing, slide down a terra cotta roof and dangle down, sometimes high from and sometimes lower to the ground. That's the thing... height of the wall in relation to the ground inside the walls varied; it wasn't predictable how high up you were from the ground. However, the height oof the walls in relation to the ground OUTSIDE seemed pretty uniform. My walk from the west end to the east end along the north wall was constantly uphill and sometimes hard work. Once I reached the east wall and walked southward, the Catedral de Avila dominated my view. IT was totally integrated into the wall. Just short of the cathedral, there was a stairway which led down the equivalent of 2-3 stories to ground level. In a room on the way down, there was a scale model of the wall which described features along it. I supoose if I had entered on that end, I would have had the benefit of the model's explanations plus the bonus of walking downhill all the way. So... to anyone who plans to walk Avila's wall, I suggest that would be the easier way to do it.