Allure of the Seas, the second of Royal Caribbean’s groundbreaking Oasis-class ships, measures in at 225,282 gross tonnes and carries an astounding 5,400 passengers at double occupancy in addition to nearly 3,000 crew members. Because she is a few inches longer than her older sister ship Oasis of the Seas, Allure of the Seas technically holds the title of largest cruise ship ever built.
With the exception of a few inches, Allure and Oasis are nearly identical in concept and layout. However, since Oasis is arguably the most innovative cruise ship ever built, this means that Allure is also pretty unique. Examples include her incredible number of guest amenities and her game-changing design, which split the monolithic cruise ship superstructure lengthwise into what are essentially two long buildings set atop her hull — one to port and one to starboard, with a common atrium connecting them.