Duke Humfrey's Library is the oldest reading room inside of the Bodleian Library at the University of Oxford. Named after Humphrey of Lancaster, it was built between 1450 and 1480 to house his collection of 281 books. Today, it serves as a reading room for maps, music, and rare books, and even made an appearance as the Hogwarts Library in the Harry Potter films.
To tour Duke Humfrey's Library, book any of the Bodleian Library tours here. Note that the minimum age for this tour is 11 years old.