The first men to land on the moon used a Saturn V rocket. Now that rocket is a LEGO set, with 1969 pieces (because the Apollo 11 mission was in 1969). It comes with a lunar orbiter, a lunar lander, and three astronaut minifigs. The rocket can separate into three stages, just like the original. The finished model is over three feet tall! To get a sense of how big that is, check out the size of the minifigs.
Since you probably don't have that much room to stand it up, it comes with three stands so you can display it horizontally. -via Kottke
Bad news this has been out of stock for about a month now and Lego hasn't said anything about getting more in stock (though I can't imagine them not).