The Lock Up at Castle Cary (reputed to have inspired the shape of the British police helmet):
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One of the best-preserved examples of an old town lock-up in the country, built (or more probably re-built) in 1779. Located in Bailey Hill, behind the Market House; nearby you can also see the fine eighteenth-century house that’s now the Post Office.
Until recently you could go into the Butchers (just behind where I am stood) and get the key to go inside, not sure what you do now as the shop has closed. It is/was licensed for wedding ceremonies (
https://www.bbc.co.uk/news/uk-england-somerset-35569592).