I have always been interested in the idea of apprenticeships or third level universities existing in the Harry Potter universe, after secondary school. While some examples of specialized training, such as Auror training, have been mentioned in the past, there was no definitive example of a college or university. I believe that I have found one. On page 36, of The Tales of Beedle the Bard, there is a footnote, that references the Wizarding Academy of Dramatic Arts (W.A.D.A), and a Herbology Professor who left Hogwarts to teach there. I'm not sure if 'The Tales of Beedle the Bard' are considered canon, but as Hermione inherits a copy in DH, I would imagine that this has at least some weight behind it.