This week's stamps are from the 1982 World's Fair, held in Knoxville, TN. The theme of 1982's expo was "Energy Turns the World," as evidenced by illustrations in the stamps.
Click for larger view.
I grew up in Nashville, and while we didn't end up making it over to the fair, I have very clear memories of the TV ads, especially the YOU'VE GOT TO BE THERE! at the end.
I'm also a big fan of the Sunsphere, built for the fair and still standing in Knoxville: