Open up GE and take a trip to Segedunum. I like writing these little placemark blurbs--they force me to be concise, which is one of my weak points.
Walking some or all of Hadrian's Wall is on my life's to-do list. What made me think about it this week was a cool travel article in the Atlantic Monthly about doing just that. The tourism industry surrounding the wall's remains is pretty robust, but from what I've read it also seems to be low-key and tasteful. Even the big museum and guest center at Segedunum (visible to the right of the ruins in the link above) seems like a cool place to spend a rainy English afternoon.