In Ireland St Patrick's Day is a national holiday - and it is celebrated in more countries than any patron saints day.

March 17 is the day which gets the whole world to think green and go green.

But if you really want to get a piece of the party, you’ve got to go to Ireland.

Ireland, according to the website, on St Patrick’s Day is unlike anywhere else in the world.

David Fallon, who has blogged live from the leading parade bus during the St Patrick’s Day Parade in Dublin, sums up the atmosphere: “I remember an Irish wolfhound the size of a bungalow trotting in front of the tooting Boston bands, and youngsters peering over their parents’ heads via makeshift ladders. Everyone in the crowd had two things in common – green gear and smiles."

While 5.5 million pints of Guinness are consumed daily around the world, on St Patrick's Day that number rises to 13 million.

This celebratory day actually evolved into a national holiday by chance.

It was originally just like any other religious feast day, but it just happened to fall during Lent.

Lent meant abstaining from many personal indulgences, and St Patrick’s Day in between gave everyone a little break.

U2 front-man Bono explained it all during a televised St Patrick’s Day special: “The whole thing about Lent – as any Irishman will tell you – is that it stops on St Patrick’s Day.”

In Dublin, the run-up to St Patrick’s Day is an excuse for a four-day festival embracing everything from salsa dancing to céilís (traditional dances); while Derry-Londonderry’s Seachtain na Gaeilge (Irish Language Week) is a lively and linguistic build-up to the big day, with events throughout the city.

The oldest St Patrick’s Day parade in Ireland is in County Wexford. It began in 1917 and is still going strong.

For the earliest, you’ll need to head out west, to Dingle. They kick things off at 6am, with the Dingle Fife and Drum Band taking to streets.

Limerick uses St Patrick’s Day to host the International Band Parade and Competition; while Cork blithely states that “Cork is THE place to be on St Patrick’s Weekend”. The city’s festival incorporates a food and crafts market, as well as music, street performers and children’s workshops.

County Armagh claims a strong connection to St Patrick and the island’s strong Christian heritage. This is where the great man founded one of his churches, so it’s only natural that they throw a week-long festival in his honour.