http://www.theheritagetrail.co.uk/roman20britain/Hadrian/corbridge_fort.htm
A Roman fort and town just west of Corbridge, it's a relatively long walk, about 1.5 miles from the center of town. The weather is cool and, of course, damp, so I'm comfortable, except for my healing tendon.
The site is very well kept and features a quite good museum, as well as the ruins of the Roman Fort. You can access pictures of the ruins in my Corbridge Fort and Town Album. I spend about an hour and a half wandering around when the weather turned downright nasty, cold, and rainy, so I didn't spend as much time as I would have liked.