In 1976, you would have paid several hundred dollars for a brand-new Apple-1 computer, the first line of personal computers designed and hand-built by Apple founders Steve Wozniak and Steve Jobs. But if you have an Apple-1 computer today, chances are it's worth quite a bit more. 

Just ask auction house Christie's, which recently auctioned off a 1976 Apple-1 for nearly half-a-million dollars in London. The computer, which is still in working condition, sold at auction for just over $470,000 to an anonymous buyer, according to Christie's.