Nottingham University have done a geophysical survey of the Roman town of Caistor St. Edmunds. The images are splendid, and confirm the town plan.
The town lies outside modern Norwich, in a large field grazed by sheep. The Roman walls rise around it, battered but still impressive. A church stands in one corner. The site is visible from the A140 Ipswich to Norwich road, and is well worth a visit. There are no tourist amenities there, no tickets to buy. I always walk a circuit around the Roman walls — it isn’t that far!