I didn't know this until recently, but you can actually go to JPL and take a tour of their facilities. I'm not 100% sure that the "Mars Yard" shown here in the video is part of the tour (my guess is that it's not), but to see the rest of JPL would be pretty cool still. Added it to my must-do the next time I'm in California.
I love this set of posters from JPL's Vision of the Future series. The latest batch of 3 posters are made by Invisible Creature to help promote intergalactic space travel. Every poster in this series is free to download and use as you see fit. You can print them out as big as you want and plaster your whole room with them. Pretty fantastic, no?