St. Patrick was not actually Irish; he was born in Roman Britain.

The first St. Patrick's Day parade took place in New York City in 1762.

Blue was the original color associated with St. Patrick's Day, not green.

St. Patrick's Day parades are not just for people. In some places, pets are also welcome to participate in the festivities

1. The largest St. Patrick's Day parade is held in New York City and attracts more than 2 million spectators.