1. I'm not really sure. How many does the size suggest?
2. The narrow parts are the extant sections of some of the original town walls. Most of the stone has been taken for buildings, and several buildings actuall incorporated the old wall in their structure.
3. I am planning to build a bridge across the river in that area. The area outside contains a spa area where people go to "take the waters" which are believed to have magical curative properties. It isn't as polluted as it is within the city's walls.
Torq