We went to Cambridge on a day trip.
The time eater
We saw this crazy clock on one of the main street corners. The grasshopper demon on the top is a Chronophage, or time eater. The first link has a cool video of the clock in action.
http://www.guardian.co.uk/artanddesign/2008/sep/18/corpus.clock
http://en.wikipedia.org/wiki/Corpus_Clock
We also saw the university, many old buildings, a market, and the river, with people punting down it. Nothing else was as good as the clock though.