if you consider a World Cruise only a cruise where you actually see everything, it might be difficult to achieve. There are only so many places you can visit in the average 120-150 day World Cruises. Royal Caribbean 278 (?) might offer most places. I am booked on 2 Costa Cruises. The itinerary 2024 might be more what you will consider a World Cruise, since it actually goes around the World. 2023 covers Africa, South America, East coast of the US, India, Middle East and plenty of places in Europe but not Australia and Asia or Northern Europe. It will take quite a few cruises to cover all the places you might want to see. On the 2024 cruise I booked the smaller ports in the Pacific, South Korea and Sri Lanka will be new to me and I will enjoy returning to all other ports even all the more familiar European destinations. My 2023 cruise, some might consider just a Grand Voyage, I have not seen the ports in Africa and off Africa, like Mauritius yet, neither India or the other Middle East ports besides Haifa. Also the islands off Portugal will be new to me. I suggest just pick what interests you most. So Royal Caribbean might be your best bet if you don't mind 9 month on one voyage.