Most expensive things you can't eat. It would be a difficult task to ingest a diamond, for instance. If you tried to chomp down on a priceless work of art, chances are you'd have security guards all over you in seconds. But bottles of wine, which just get better with age, can go for record-breaking prices at auction houses, and people can pop them open for special occasions. That is, after a point -- wines older than 50 years begin to decline and eventually turn into vinegar. But that doesn't stop serious collectors from paying even more for them. How well do you know your wine?