If you had to guess what is secured in the many lockboxes of banks around the world, you’d probably come up with a list of precious metals, jewels, and currency. You might be surprised to find out that in some cases, a tiny sheet of sticky paper, no more than an inch or two square, could be holding the key to millions of dollars.
The 21 most valuable stamps in the world are rare pieces packed with interesting history and countless mistakes. One could have led to the uncovering of military secrets. Another showcases the first plane used for mail transport. While the most expensive stamp exemplifies a worldwide lust for extravagant parties and balls.
When you’re looking for the rarest stamp, you’re going to see a whirlwind of stories from around the globe. Just don’t forget to keep your eyes open, and maybe don’t be so quick to send off that box of old stamps your grandparents handed down to you.