"Aren't you two ever going to read Hogwarts, A History?"
"What's the point? You know it by heart, we can just ask you?"
Hermione and Ron (GF28)
Hogwarts: A History is a one-thousand-page book about the thousand-year history of Hogwarts School of Witchcraft and Wizardry. The book describes such things as the enchanted ceiling of the Great Hall (PS7), the fact that the Founders thought boys were less trustworthy than girls (OP17), and other facts. One topic covered thoroughly is the manner in which Hogwarts is hidden from Muggles (GF11). The book makes it clear that no one can apparate into, out of, or onto Hogwarts school grounds (PA9, OP23). It also mentions that should a Muggle wander by, all they would see is a mouldering ruin and a sign saying DANGER, DO NOT ENTER, UNSAFE (GF11). It states that Muggle electronics don’t work on Hogwarts grounds (GF28). In all of its pages, it never mentions the Hogwarts house-elves (GF15).
Hermione was very fond of the book, and was one of the only people Harry knew who had actually read it. She didn’t bring it to school during her second year because she couldn’t fit it into her trunk, what with all the Lockhart books (CS9). She did,however, carry it with her on their long search for Horcruxes (DH6).