They also recorded their biggest audience to date when they played to 80,000 in Slane Castle in Ireland and ending with a Christmas show at the Millennium Stadium, Cardiff, supported by Feeder and Ocean Colour Scene - who they had supported years before.
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Notable natural amphitheatres include the Drakensberg amphitheatre in Drakensberg, South Africa, Slane Castle in Ireland, the Supernatural Amphitheatre in Victoria, Australia, and Echo amphitheatre, Red Rocks Amphitheatre in Morrison, Colorado and The Gorge Amphitheatre in Washington State, United States.
He is often termed 'the rock and roll aristocrat' or 'the rock and roll peer' owing to his very successful series of rock concerts from 1981, held in the natural amphitheatre of the grounds of Slane Castle.
Although Slane Concerts at Slane Castle are traditionally held once a year, U2 played two concerts.