You could call it the original expat holiday: The first St. Patrick´s Day parade was held in New York City in 1762, by homesick Irish soldiers serving in the British military. The day marks the life of Patrick, a 5th century slave turned pedagogue and saint. Ironically, Patrick was not Irish but from a wealthy English family. He was taken to Ireland by slave-traders who captured him during a raid. Today cities on every continent pull out all the green stops and celebrate in style. Ironically it took centuries for the party to start in Ireland; until the 1970s Irish law stated pubs had to be closed on March 17 owing to the religious significance of the day. In 1995, the Irish government got wise to the financial harvest to be reaped from the three-leaf clover. Dublin now hosts one of the largest celebrations in the world.