The Foundation has its roots in a combination of creepypasta and dry academic tone. What are some good places to look for inspiration for things for the Library?
I personally think medieval travelogues, the more fantastical, the better (Sir John Mandeville is very good in this regard). Also, the stranger parts of Fallen London, with its suggestions of mysteries wriggling just below the surface.
Also, on an unrelated note, when the Foundation makes the move from Wikidot to a new host, will the Library follow?