DUBLIN, IRELAND - MAY 18: Queen Elizabeth II and Prince Philip, Duke of Edinburgh visit the Guinness Storehouse on May 18, 2011 in Dublin, Ireland. The Duke and Queen's visit to Ireland is the first ... more 
DUBLIN, IRELAND - MAY 18: Queen Elizabeth II and Prince Philip, Duke of Edinburgh visit the Guinness Storehouse on May 18, 2011 in Dublin, Ireland. The Duke and Queen's visit to Ireland is the first by a monarch since 1911. An unprecedented security operation is taking place with much of the centre of Dublin turning into a car free zone. Republican dissident groups have made it clear they are intent on disrupting proceedings. (Photo by Irish Government - Pool/Getty Images) less 
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Wed, May 18, 2011 9:04 AM EDT