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One-hour tours are easily arranged of the city's unique medieval (and now out of use) water system. Not for the claustrophobic! The entrance can be found next to the Princesshay shopping development.
Exeter Castle
The grounds and the remaining Norman structures are open to the public, but the central part of the castle has been retired from service as an Assize Court. It is now a wedding and events venue with holiday lets.
And the Cathedral Green; Exeter's top attraction and a very beautiful Gothic building. The cathedral lays claim to having the longest unbroken stone roof beam of any building in the world. The Cathedral Green opposite can be a good place to chill out on in the summer, ideal for an inexpensive picnic.