3. Allure of the Seas
Allure of the Seas is one of the largest yachts in the world today. The yacht is like a giant hotel on the sea with a capacity of 6,687 people, along with many other entertainment venues. Allure of the Seas features 4 swimming pools, 10 whirlpools, a two-story discotheque, a 1,380-seat theater, an ice rink, a spa, and fitness facilities.