THE world turned green today as everywhere from Sydney to Seoul celebrated St Patrick's Day.
And Dublin certainly wasn't being outdone, with the GPO, Trinity College and even the Jeanie Johnston tall ship all illuminated last night.
Close to one million people were expected to flock to the city centre over the weekend.
While today's parade was the major event of the festival, it's not the only one that can be enjoyed over the bank holiday weekend.
Organisers are predicting that over 120,000 overseas visitors will join half-a-million Irish in the city centre today alone.
"Obviously the weather is a big factor, but that won't affect our overseas turnout, and were expecting about 120,000 from all over the world," said Edelle Moss, spokesperson for the St Patrick's Day Festival.
It seems everyone's going green this year.
Among the famous landmarks to go green are Italy's Leaning Tower of Pisa, Niagara Falls, San Francisco's Coit Tower, the Cibeles fountain in Madrid, an entire town on the Costa Blanca in Spain, the Brussels Town Hall, Vienna's Burgtheater and the Palace of Culture and Science in Warsaw.
In London, the London Eye and Selfridges department store have also been given the 'green light' and even the Municipal Stadium in Poznan, Poland, where Ireland will play two matches in this summer's European Football Championships, has been added to the greening list.
The publicity generated is worth around €230m in advertising.
Turnout is also expected to be high at the smaller events. The St Patrick's Festival 5km run has become one of the best fundraising events of the weekend, with proceeds going to Our Lady's Children's Hospital, Crumlin.
The race begins at noon from the Mansion House on Dawson Street. As well as street performances on Coppinger Row, the Trad Stage at Temple Bar Square is expected to be a hive of activity, with pubs and restaurants ready for one of their busiest periods of the year.