This recently (2021) published little book will help anyone appreciate the architecture of the town (beautiful or otherwise). It's arranged as a series of walks with more detailed information in sections on the Maison Dieu, the Duke of York's, churches and Kearnsey Abbey/Russell Gardens.
It's a serious look, sometimes critical (often humorously); and if you can't tell your pilasters from your pediments, or your corbels from your voussoirs, then you may need a dictionary.
(ISBN: 9780956550965 for any librarians out there.)