When in Bath one must visit the Roman Baths. Fortunately, actual bathing wasn't part of the visit as the water is not terribly inviting; it is green due to algae. I have read that it is drained and cleaned in the spring, just prior to tourist season.
The first photo is the one that everyone takes while visiting the Roman Baths. In the background is the abbey and between the baths and the abbey is one of the plazas that feature live music throughout the day.