Sister ship Wonder of the Seas is the biggest cruise ship in the world by interior volume. Harmony of the Seas also features the world’s tallest slide at sea, Ultimate Abyss, and a slew of other ...

The gigantic 227,000-ton Harmony of the Seas is 216ft wide and, at 1,187ft in length, 164ft longer than the Eiffel Tower is tall. It has room for 8,500 passengers and crew, a 10-storey slide and ...

Harmony of the Seas also has seven 'districts' which include a cinema, promenade, sports and youth zones, an entertainment palace and spa and fitness centre.

As can be seen in the photos above, Harmony also is home to a multi-deck water slide area, something Royal Caribbean has just begun adding to ships this year. It's also the first Oasis class ship ...