The world's biggest-ever cruise ship sails from Southampton, England to Barcelona. Harmony of the Seas weighs 120,000 tons and is 362 meters long (which is 50m longer than the Eiffel Tower). Its 16 passenger decks house 20 restaurants, 23 swimming pools, a park with 10,000 plants, three aquaparks, a 3D cinema, a skating rink, two climbing walls, a basketball court, a casino, and almost 5,500 passengers who are clients of the Royal Caribbean cruise company.