The largest cruise ship ever built cost $1 billion - and it just set sail

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Harmony of the Seas Royal Caribbean

REUTERS/Stephane Mahe

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Royal Caribbean took delivery of its newest ship on Sunday. Harmony of the Seas is the third ship in Royal Caribbean's Oasis class - Oasis of the Seas and Allure of the Seas entered service in 2009 and 2010, respectively. At 1,188 feet long and with a gross tonnage of 226,963 , the billion-dollar Harmony of the Seas is the largest cruise ship ever built.

Harmony took the title of world's largest cruise ship from its sister vessel, Allure of the Seas.

Thousands gathered to watch Harmony of the Seas sail out of STX Europe's shipyard in St. Nazaire, France for the first time on its way to Southampton, England.