Check this out!!

http://www.postcrossing.com/

I signed up for this as a way to teach the boys about other places around the world, languages, etc. I am going to take the post cards to D's school and share them with his classmates. I think this is a great idea. Wish I had found it sooner. I love postcards and have been collecting them for many many years. My grandma started me on them when she would be out traveling around the U.S and would send me a card from every state she stopped in. I am still short a couple of states but not many. Just thought I would share.