Costco might be known for its bargains, but most would be hard-pressed to afford these goods. Here are five of the priciest ...

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 ...

Most people assume “valuable” means luxury handbags, rare coins, or antique furniture. But the truth is, some of the most expensive items are hiding in plain sight—stuff you may already own, use ...

Each year, Sotheby’s and Christie’s, the top auction houses in the country, put culturally significant blue-chip art from precious art collections up for sale. This year, both auctions took place in ...