I was lucky enough to do a programming contract for the museum of London back in the mid eighties when its only site was in the Barbican. We worked weekends in a back room on a pdp11 key:value index.

The museum is a treasure house of the history of London and the archival legatee of many of the guilds and societies.

I usually shy away from gushing recommendations but I think the MOL is one of my favourites, the docklands site was the venue of a conference social one year I went to.. well worth a visit.