Green landmarks publicity 'would cost €20m if we had to pay for it'

More than 100,000 tourists have come to Ireland for St Patrick's Day - and there are events all over the globe to mark it.

Tourism Ireland has said it is impossible to put a price on the publicity that Ireland receives around the world on St Patrick's Day.

More than 190 landmarks around the world are taking part in the Global Greening campaign to celebrate our national holiday.