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 ...

The world’s most famous painting with a secret message was stolen from the Louvre over a century ago. The criminal, Vincenzo Perugia, was a handyman working at the museum, and he had two handy ...

The world’s most expensive substances command their prices for very different reasons. Some, like rare gemstones, are valuable because nature produces them in such limited quantities. Others, such as ...