With all of today's advanced forms of communication, it's not surprising that you don't send letters as often as you used to. However, you shouldn't throw your old stamps away just yet -- they may be worth a lot of money.
You may not be aware, but stamp collecting is an extremely popular hobby, and some collectors are willing to pay millions for old stamps.
For example, a British Penny Red is valued at upwards of $795K -- and that's just if it's in mint condition. Other valuable types include Chinese stamps, Indian stamps and stamps with a picture of Queen Victoria on them.
If you happen to own any of those stamps or even one with an error, then you may be in luck. Check out the slideshow above to see what some of the rarest stamps are going for on eBay.
You never know, you may possibly have a small fortune hiding away in your kitchen drawer.