Bushmills is the world's oldest licensed distillery, having been given permission to produce whiskey by King James I in 1608. The whiskey is made with Irish barley and water from St Columb's Rill, a tributary of the River Bush, and matured in oak barrels. During ageing, the alcohol content drops from around 60% to 40%; the spirit lost through evaporation is known as 'the angels' share'. After the tour, you can try a free sample of your choice from Bushmills' range.