Allure of the Seas held the title of "the largest ship in the world" until fleetmate Harmony of the Seas launched in 2016. Clocking in at a whopping 4,074 passengers at double occupancy (and more than 7,000 at full capacity), the ship feels like a small city. In order to help passengers avoid getting lost — or at least get lost less often — it's divided into seven “neighborhoods,” all packed with more activities, entertainment, and dining options than you can possibly experience in a week. As a result, the ship has a loud, fun atmosphere that feels inspired by the brashness of Las Vegas, with a dash of Orlando theme park thrown in.