I have added a new type of Grand Monument: the Library.
Libraries hold books, which are currently quite rare. Once you shelve a book in your library, your NPCs make copies of it and you can take as many as you want. In fact, you’d have to burn them all to get rid of it altogether.
There’s also a new bookedit command that actually lets you create books! Fill in your own libraries and trade books with other empires to bolster your collection.