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Chicago continued its 51-year tradition of colouring it's river green to celebrate St. Patrick's Day.
Thousands of revellers watched the festivities from the bridges as the water was dyed emerald green before the city's parade.
New York City Mayor Michael Bloomberg has taken part in his last St. Patrick's Day parade as mayor of the city:
St Patrick's Day festivities have begun in New York City as the parade made their way up Fifth Avenue. Both the New York Fire Department and NYPD joined in on the annual event.
Egypt's pyramids and sphinx have been illuminated in green light to mark St Patrick's Day tomorrow.
They are one of almost 70 famous landmarks around the world that are being lit up to celebrate Ireland's National Day, according to Tourism Ireland.
Other green landmarks include Sydney Opera House, the London Eye, Niagara Falls, the Leaning Tower of Pisa and Anfield Stadium in Liverpool.
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Iconic landmarks around the world have been lit up in green to celebrate St Patrick's Day on Sunday.