The $4.8 billion History Supreme, owned by Robert Knok, is the world's most expensive and largest superyacht. History Supreme, which is 100 feet long, took three years to build and used 10,000 kg of solid gold and platinum, both of which adorn the dining area, deck, railings, staircases, and anchor. If that isn't enough, the master suite also has a meteorite rock wall, a Tyrannosaurus Rex bone statue, a 68 kilogram 24-carat gold Aquavista Panoramic Wall Aquarium, and a liquor bottle encrusted with a rare 18.5-carat diamond. ¹⁾