U2's Vertigo Tour was a worldwide concert tour staged in support of their 2004 album How to Dismantle an Atomic Bomb, visiting arenas and stadiums between March 2005 and December 2006. The tour comprised 131 shows across four legs: North American arenas (spring 2005), European stadiums (summer 2005), a second North American arena leg (fall 2005), and an international leg (2006). It sold 4,619,021 tickets and grossed $389 million, making it the second-highest-grossing concert tour at the time.