First built by the Normans in the early 1200s, King John's Castle still bears traces on its north side of a 1691 bombardment. If you climb the drum towers (the oldest section), you'll have a good view of the town and the Shannon. Inside, a 22-minute audiovisual show illustrates the history of Limerick and Ireland; an archaeology center has three excavated, pre-Norman houses; and two exhibition centers display scale models of Limerick from its founding in AD 922.
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