By Honida Beram.
Image Credit: Royal Caribbean
Ever wondered what it’s like to step onto a cruise ship so big it feels like a city on water?
These mega-ships aren’t just a form of transport, they’re playgrounds, resorts and entertainment hubs all rolled into one. Add a splash of fine dining, sparkling pools, twisting water slides, zip lines soaring over decks, rooftop parks, ice rinks, go-karts and Broadway-style shows and you have the ultimate vacation.
As engineering wonders, mega ships are designed to thrill and delight cruisers of every age.
So, let’s set sail and embark on an adventure to discover the top 10 largest cruise ships in the world, and take a glimpse into what it’s really like to explore these ocean giants firsthand.
Image Credit: Royal Caribbean
The largest cruise ship in the world is Icon of the Seas, part of Royal Caribbean’s new Icon Class. Launched in 2024, this floating city takes cruising to an ‘iconic’ new level.
Gross tonnage: 248,663 GT
Length: 364.75 m (1,196.7 ft)
Beam (maximum width): 66 m (217 ft)
Staterooms: 2,805
Passenger capacity: 5,610 (7,600 maximum)
Icon of the Seas has multiple neighbourhoods, including pools, a waterpark, sports facilities, an AquaTheater and even a skydiving simulator. I can tell you that you’ll never see anything quite as amazing as the diving show. It’s pure thrill meets splashy jaw-dropping spectacular. Watching acrobats soar from dizzying heights into a shallow pool below all while on a moving ship is truly remarkable.
Dining options are almost endless, from casual eateries to specialty restaurants. Whether you’re traveling with family, friends or solo, Icon of the Seas ensures there’s something for everyone to enjoy.
Image Credit: Royal Caribbean
It’s worth noting that many of the largest ships in the world are Royal Caribbean vessels, dominating the top of the list with their Oasis and Icon Class ships. Their scale, entertainment options and innovative designs have set the standard for what modern cruising can be.
As mentioned above, the largest cruise ship in the world, Icon of the Seas, is 248,663 GT and 364.75 meters long. With 2,805 staterooms and a maximum of 7,600 passengers.
This shining ship made her debut in August 2025 and matches Icon of the Seas in size and features. From zip lines and sports facilities to theatres and specialty dining, she promises an immersive cruising experience for multi-generation families but also great for couples and solo cruisers. She’s a favourite of large groups, celebrating milestone events.
The newest Oasis Class ship, Utopia of the Seas, weighs 236,473 GT and is 361 meters long. With 2,834 staterooms and 5,668 passengers, she features the stunning Central Park with real trees, a Boardwalk, pools, and a variety of entertainment options that make every day a new adventure.
Image Credit: MSC Cruises
Wonder of the Seas was previously the largest cruise ship, and I was fortunate to sail on her from Barcelona to Rome. At 235,600 GT and 362 meters long, she carries up to 6,988 passengers. The Wonder is a marvel of cruising luxury.
Symphony of the Seas is 228,081 GT and 361 meters long, with a maximum of 6,680 passengers. Featuring zip lines, surf simulators and an ice rink, she’s a lively and vibrant vessel.
Harmony of the Seas measures 226,963 GT and 362 meters in length. Famous for the Ultimate Abyss - the tallest slide at sea – she also features multiple themed neighbourhoods. Each area has its own unique vibe, from relaxing parks to bustling entertainment zones.
The original Oasis Class ship, Oasis of the Seas, weighs 226,838 GT and is 360 meters long. On Oasis, you can escape reality entirely! When she launched in December 2009, she was the largest cruise ship in the world and introduced the world to the Oasis Class, a game-changer in scale and design.
Oasis was the first Royal Caribbean ship that was divided into ‘neighbourhoods’, including Central Park with real trees, a Boardwalk complete with a carousel, and the AquaTheater.
Image Credit: Royal Caribbean
Slightly smaller than Oasis at 226,637 GT, Allure of the Seas offers similar neighbourhoods, entertainment, and dining. It’s one of the most popular ships for first-time cruisers and mega-ship enthusiasts.
MSC’s largest ship to date, World America, is 216,638 GT and 333 meters long. With 2,626 staterooms and up to 6,762 passengers, she combines luxury, entertainment and innovation, including expansive promenades and multiple dining options.
Close behind is MSC World Europa at 215,863 GT. The ship’s 333-meter length accommodates up to 6,762 passengers. From eco-friendly technology to world-class dining, Europa offers a modern cruise experience with style and sustainability.
Image Credit: Royal Caribbean
Having sailed on both Wonder of the Seas and MSC World Europa, I can confidently say that mega cruise ships are truly floating cities – and both blew me away.
At the time of my voyage in 2022, Wonder of the Seas was the biggest cruise ship in the world, and at first, I was quite intimidated. One thing is for sure: you definitely get your steps up traversing the decks. A favourite memory was wandering Central Park. It felt like stepping into a lush, outdoor oasis – amazing when you remember you’re actually on a man-made ship. The AquaTheater shows were hands down the best shows I’ve ever seen at sea.
And while I don’t like calling favourites, my time aboard MSC World Europa, with its sleek design and innovative LPG technology - that has now set the standard for sustainable cruising - offered a different kind of luxury.
My ‘cruise’ didn’t actually go anywhere! I was invited to experience the ship’s Naming Ceremony in Doha, Qatar – the most remarkable cruise event I’ve ever attended. The stunningly appointed spacious public areas, top-tier dining venues, and a futuristic promenade were both elegant and exciting. The week I spent on board World Europa was one of my best sea memories and will live on in my mind for a very long time.
Image Credit: Royal Caribbean
Beyond size, these mega ships redefine cruising. The multiple neighbourhoods or zones with unique themes mean cruisers are always discovering something new – you’re never, ever bored on board.
The ‘fun’ extras are state of the art (think water slides, surf simulators and zip lines). Shows and live entertainment are world-class and the various dining option mean you’re served an array of cuisines to suit every palate.
From Icon of the Seas to MSC World Europa, sailing on one of these vessels is an adventure in itself, whether you’re seeking thrills, relaxation or a little bit of both. The ship really is the destination.
If you ever get the chance, I highly recommend experiencing a mega ship firsthand. They’re more than just floating cities, but adventure-packed playgrounds at sea, where every deck holds a new thrill that creates moments you’ll never forget.
Mega ships are more than transportation, they’re destinations in their own right, offering unforgettable experiences for travellers of all ages. With larger, bolder and more innovative ships entering service, the future of cruising is bigger and brighter than ever.
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