Can't vouch for all of them, e.g. https://en.wikipedia.org/wiki/BritishLawnmowerMuseum is a bit specialist
If you head for the World Museum or Walker Art gallery, Central Library is worth checking out for the interiors, both the new (refurb) and old architecture.
Generally, there's a lot of good Victorian & Edwardian architecture interspersed with late Georgian (again, see WP)
// @hazardwarning @kyle