This is London's newest Museum, and is free entry-
A rarely seen before part of London's roman wall and it's full history, in context, up to modern times.
https://citywallvinestreet.org/
This is the Ian Visits write up about it-
https://www.ianvisits.co.uk/articles/londons-newest-museum-shows-off-a-huge-slice-of-roman-wall-62592/?fbclid=IwAR2Mz5KnDLiodZfcfIA4impfAYtWxF0_q3FYdMaJWTbhnVPnzaotHn_C8Ak