See if you can join a guided tour at Chester City Hall. If not, this grand structure is still worthy of a photograph from the outside.
You'll have sightseeing choices galore when in Chester. Chester City Hall is a good place to start here, but there are lots of other fine spots to visit. Swarthmore College, Harrah's Casino and Racetrack, and Subaru Park are near the historic landmark and and will cap off your day nicely.