The long expanse of St John's new court (built in 1831), on the opposite side of the river from the bulk of the college.
I like it, though opinions apparently differ. Wikitravel calls it "dramatic" while Frommer's calls it "an architectural 'folly' of the 19th century ... a crenellated neo-Gothic fantasy ... adorned with a 'riot' of pinnacle sand a main cupola."