St Peter's Church sits in Castle Park where the overwhelming and consistent smell of weed mixed with urine is off putting. Certainly wouldn't like to walk through there at night, but on a sunny autumnal day it was quite pleasant, smell aside. For a 'ruin', the church is a quite in-tact. Bombed during WWII it sits as a memorial of a dark time. You cannot enter the church but you can wander around the outside, taking in some flower beds, the park it sits in and an offshoot of the River Avon flanking it's southern border. Entering the park via Castle Bridge (pedestrian) gives you the best view of the church.