Wow this is a nice hidden gem. It's located right near the baptistery. The full length of the wall is 3km but it has points along the way that you can enter and exit. It starts at the Tower and ends by the Arno River. It cost five euros to enter and will give you such a unique view of this beautiful city. You will see areas that some don't see but also get a nice easy walk too. Honestly it's such a great way to spend a few hours. read more