Ravenclaws with huge communal bookshelfs that tower to the ceiling. It’s become tradition that when you leave Hogwarts, you leave behind a copy of your favorite book, so they have books dating back centuries.
SO MANY MUGGLE NOVELS CONTAINING NO MAGICAL ABILITIES WHATSOEVER AND THE WIZARDS READING THEM AND GETTING THEIR MINDS BLOWN
Down the back corner of the far shelf sits a modern reprint of Newton’s Principia Mathematica. The prefects take it from the curious first years’ hands, chuckling. “You’re not ready for that one yet,” they say. “In another life, you might be, but in this castle, it’s going to be triply hard to understand. Let me recommend you some background reading first.”
Pride of place is Tolkein’s The Lord of the Rings, and it’s somewhat of an initiation ritual for purebloods to read it. The older students take bets on how long it will take each student to realise it’s not a history book.
The Shakespeare collection is quite large, and there’s an unofficial rule against enchanted translations of it. This came about when one frustrated reading group poring over Romeo and Juliet enchanted the book to read a modern, context-aware translation aloud, and filled the Common Room with vulgar swearing and dick jokes until somebody managed to shut it off. People still remark that the puns were pretty damn clever.