For the first time, Royal Caribbean details an epic 274-night Ultimate World Cruise that will visit all seven continents, call at 150 destinations in 65 counties that include 11 wonders of the world. Serenade of the Seas will be the lucky ship to offer one of the most spectacular and longest cruises ever offered. Serenade of the Seas World Cruise It’s going to be a cruise to remember, with Serenade of the Seas sailing a 274-night Ultimate World Cruise which will be the longest out there. The voyage will commence from Miami, Florida, on December 10, 2023, and end back...