Theoretical Structural Archaeology has an interesting series on the building of Hadrian’s wall:
- Hadrian’s First Wall [Part 1 of 3]
- Hadrian’s First Wall [Part 2 of 3]
- Hadrian’s First Wall Part 3 of 3
… I kept getting redirected to some webring page (webrings are still around?!) which was rather annoying … YMMV