Following the release of No Line on the Horizon, U2 staged a worldwide stadium tour, titled the U2 360° Tour. Beginning on 30 June 2009 in Barcelona, the tour visited Europe, North America, Oceania, Africa and South America from 2009 to 2011 and comprised 110 shows. The concerts featured a 360-degree stage that the audience surrounded. To accommodate this, a large four-legged structure n…