The streets of Ireland will be painted green today as the country celebrates St Patrick's Day.
Thousands are expected to pack into the centre of Dublin for the annual parade.
The country's leading pageant companies and some of the biggest marching bands from around the world will snake through the streets creating a colourful spectacle with floats, dancers and performance artists.
To mark The Gathering - Ireland's year of homecoming celebrations - the public has been asked to take part in the first ever People's Parade. Organisers have invited 8,000 people from all over the world to march in the procession, which will be held before the main parade.
It will take the same route throughout the city centre from Parnell Square to O'Connell Street, across O'Connell Bridge to Westmoreland Street, along Dame Street and Lord Edward Street to Christchurch and finishing at St Patrick's Cathedral.
Meanwhile, volunteers from Dublin Pride and BeLongTo will represent the lesbian, gay, bisexual and transgender (LGBT) community in the main parade. It will be the first time such a large LGBT group will take part in the annual event marking Ireland's national holiday.
Other parades and parties will be held across the island of Ireland - including in Belfast and Cork.
But the Emerald Isle will not be the only place to celebrate St Patrick.
As the country's sprawling 70 million-strong diaspora takes part in some form of festivities, some of Earth's most famous sights - including the Pyramids of Egypt and Rio de Janeiro's Christ the Redeemer statue - will be lit up green.
The Sydney Opera House, Niagara Falls, the Leaning Tower of Pisa, Burj al Arab in Dubai, Table Mountain in South Africa, New York's Empire State Building and Berlin's TV Tower will be among others to pay tribute to Ireland's patron saint with emerald lighting. It is hoped the celebration will remind people from all over the world of Ireland's charms in a bid to boost future visitor numbers.