a social document

Hello everyone, I am working on a document for VisitBritain website (the national tourism agency, responsible for marketing Britain worldwide & developing Britain’s visitor economy.)

What do they mean by "a social document" in this context: "
Well worth a visit is the Judge’s Lodging museum, which has been called ‘a fascinating social document – an amazing survival’ and ‘the most remarkable survivor of all UK court buildings."

Thank you for you help :)
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