The World's Most Expensive Yachts (And The Billionaires Who Own Them)

Even among billionaire megayacht owners, there's competition to be the biggest and best.

In celebration of the Monaco Yacht Show, which kicks off Wednesday, our friends at Wealth-X shared the estimated values of the 10 most expensive yachts on the planet.

From a movie mogul's secondhand yacht to a futuristic design by Philippe Starck, these boats are like small cities on water.