Our new photo tour in the carousel above offers a ship-by-ship look at the new Kings of the High Seas, starting with the 50th largest and counting down to No. 1. It's a list that won't remain static for long. More giant cruise vessels are on the way, including Royal Caribbean's 167,600-ton Anthem of the Seas and Norwegian Cruise Line's 164,600-ton Norwegian Escape.
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As for the once mighty Carnival Destiny, now renamed Carnival Sunshine: Even after an expansion in 2013 that boosted its size to 102,853 tons, it doesn't even make the list of biggest megaships. In today's cruise world, it's almost midsize.