New College is one of Oxford's older colleges despite its name, founded in 1379. Its chapel, cloisters, city wall, and quiet quadrangles make it a worthwhile college visit, especially because it sits close to the Bodleian Library and Radcliffe Camera.
The cloisters are also known to film fans as one of the Oxford locations used for Hogwarts scenes. Check visitor opening times before going, as college access can change during term and exams.