I had a bit of a laugh when I first saw this door. Perhaps you are having one now as you look at it. Isn't this a funny door....or whatever it can be called? All I can guess and certainly you might guess the same, is that this was some kind of a store at one time and the low wall served as part of the store's front and display area. It is nice that it has stayed this way if it really was once this. Luckily the door is rather high and the arch is a tight one because if it were lower and the arch was different, it might be painful to walk through this door if you aren't paying attention! I like this little door/whatever...it makes me think of a three-legged table or even one of those half tables that only have 2 legs because the table is supposed to be placed against the wall. This door has no handle, so I'm guessing that access to it is from a different entrance...nevertheless, a peephole does exist!! What a fun door!!