The Tallest Slide at Sea on Harmony of the Seas Delivers Top Thrill FactorParker McDonaldWednesday, June 15, 2016Wednesday, November 27, 2019 Wednesday, June 15, 2016Wednesday, November 27, 2019 Royal Caribbean International’s Harmony of the Seas, the world’s largest cruise ship, claims another record as home to the tallest slide and most exhilarating adventure...