From billion-dollar yachts to diamond watches and rare art, explore 15 of the most expensive things ever purchased by the world’s wealthiest people ...

A painting by Édouard Vuillard soared from a $254,000 sale at Sotheby’s last November to $2.7 million at a regional auction ...

The most expensive bag in human history will head to a Japanese vintage reseller—but it’s not going back on the market.