Dublin's latest sporting colossus replaced Lansdowne Road - the original home of Irish international rugby and football. The undulating arena holds 50,000 spectators and, with Ireland's reputation for rainy weather, it's good to know the tiered seating is covered with that curved roof. The stadium also hosts music concerts, and you can get a sense of what it feels like to be a player with a behind the scenes tour. 

Tours: Adult €10, conc. €7, child €5.