Wikipedia List of Walled Cities
I discovered the Wikipedia List of Walled Cities today.
Now to make a google earth file with all these locations pinned in it
Cool. I've been to some of those. Xi'An was the most impressive. It's the most intact city wall in the world. I remember walking through it and looking up from the base. Then I imagined being one of a group of tiny little horsemen coming across it in ancient times. I would have turned around and ridden back. It's massive.