The Best Cruise Lines in the World

9. Royal Caribbean International
If you truly want to feel like you’re living in a floating city, Royal Caribbean is the cruise line for you, given that it has the four largest cruise ships in the world. Symphony of the Seas, Harmony of the Seas, Allure of the Seas, and Oasis of the Seas top the lists in terms of passenger count (about 6,700 at full capacity), length (nearly 1,200 feet long), and gross tonnage (more than 225,000 tonnes). Given their size, these ships provide every amenity you can think of—and plenty you can’t even imagine—from waterparks to world-class musical productions to autonomous bars staffed by robots to double-decker suites with slides for the kids. You’ll find these behemoths sailing the Caribbean and Mediterranean throughout the year, but with so many activities on board, you might not even want to leave the ship.