As part of a weekend exploring sites along Hadrian’s Wall in Northumberland, we go to Vindolanda, an amazing walled town that has been carefully excavated. It is fascinating to view the juxtaposition of the formal walled town with the informal, more organic settlement outside. Both are important and needed in their own way, as most urban evolution can testify. The rigidly planned can be too constraining and inflexible, while overly organic can be too chaotic and difficult to manage. But well worth a visit whatever your preference.