Never one to do things by halves, Royal Caribbean has created the world's largest cruise ship – at a whopping 1,198 feet (365m), with space for 7,600 passengers on board. Icon of the Seas, the first of the line's Icon-class ships, is due to set sail in January 2024 – and people are excited about it. In fact, when the ship's first sailing went online in October 2022, the cabins sold out in hours. Icon features 20 decks and eight themed neighbourhoods, including Thrill Island, home to the largest waterpark at sea and six record-breaking slides; and Chill Island, which boasts the line's first swim-up bar at sea.