Inside the largest cruise ship ever built

Harmony of the Seas is built on the same platform as Royal Caribbean's giant Oasis of the Seas and Allure of the Seas, the current size leaders in the cruise world, but it eclipses its siblings by nearly 1,700 tons and offers a number of new features. Among them: Ultimate Abyss, which just might be the most thrilling attraction ever conceived for a cruise ship. Comprised of two swirling slides, it drops 10 stories from near the top of the vessel down to one of its lowest decks.