Passengers wave from the decks as the Harmony of the Seas cruise ship sets sail from Southampton, southern England, on May 22, 2016. At 120,000-tonnes, and 66 metres (217 feet), Royal Caribbean's 'Harmony of the Seas' is the world's biggest-ever cruise ship. The widest cruise ship ever built, its 362-metre length makes it 50 metres longer than the height of the Eiffel Tower. The ship is headed for Southampton in southern England and is to embark on its official maiden voyage on May 22 to its new home port of Barcelona. / AFP PHOTO / ADRIAN DENNIS