The two biggest cruise ships in the world are:
1. Symphony of the Seas: Symphony of the Seas is currently the largest cruise ship in the world. It is operated by Royal Caribbean International and can accommodate around 6,680 passengers at double occupancy. It features a variety of amenities and entertainment options, including multiple pools, water slides, theaters, restaurants, and shops.
2. Harmony of the Seas: Harmony of the Seas is another massive cruise ship operated by Royal Caribbean International. It is slightly smaller than Symphony of the Seas but still ranks among the largest cruise ships in the world. It can accommodate around 6,687 passengers at double occupancy. Similar to Symphony of the Seas, it offers a wide range of onboard activities and amenities for guests to enjoy.