Royal said the itinerary, which will span all seven continents and more than 150 calls across 65 countries, would be the “longest and most comprehensive” world voyage available.

Serenade of the Seas will sail round-trip from Miami on 10 December 2023 and return on 10 September 2024. 

Bookings opened on Wednesday (20 October) with exclusive early access for the line’s Crown & Anchor Society Diamond status members and above.

As part of Royal’s Ultimate World Cruise, guests will visit 57 destinations new to the line and exclusive to the itinerary.

They include Casablanca, Qaqortoq (Greenland) and Shimizu (Japan) – the gateway to Mount Fuji.

Guests who book the full Ultimate World Cruise will be given business-class airfare, “premium” transportation and an “evening of festivities” at a five-star hotel before setting sail in Miami.

Crown & Anchor Society Platinum status members and above will receive a bonus Seven New World Wonders shore excursion package in addition to other perks, including a deluxe beverage package, VOOM Wi-Fi and laundry service.

Royal president and chief executive Michael Bayley called the voyage “the world cruise of world cruises”.

“Now, more than ever, people have resolved to travel the world and make up for lost time,” he said. “Royal Caribbean is making that a reality with the ultimate holiday that welcomes those seeking adventure and exploration to taste, dance and dream with us around the world. To travellers asking themselves where they should go next, we say everywhere.”