Mentioned by Lonely Planet Top Choices
Top things to do in Ireland
"An obdurate and brooding Norman mass over the River Shannon, Limerick's showpiece castle, with its vast curtain walls and towers, was built on the orders of King John of England between 1200 and 1212. The massive twin gate towers still stand to their full height. A multimedia experience that provides an excellent potted history of Ireland in general, and Limerick in particular, is followed by exposed archaeology in the undercroft and a tour of the courtyard and fortifications."