Atlantic Impact instead? They are based in Detroit Michigan, and they distribute postcards to students in low-achieving schools to expose them to new places and ideas and help broaden their horizons. You don't have to be in Tuscany or Tokyo to send a postcard--your home city/state might be novel to one of their students, and receiving a piece of personal mail from you could mean a lot to that young person.
I just sent off an envelope with postcards I've been collecting from France and Spain. It was fun writing factoids on the back and describing what I found the most interesting about each place. I plan to continue sending them from the US when I return this summer. I hope you will consider writing to Atlantic Impact, too!