We have a friend who works at NASA and took us for a personal tour. There were a lot of places we couldn't go into because they were restricted but we still saw some cool things like the outside of the biggest wind tunnel in the world!
An aircraft hanger
Flight simulators: this one had the cockpit for a spaceship. We were told the simulator could go 22 feet per second!
I put this video here to show how big the room is. The simulator travels around the room when people are using it. Pretty big huh?
Sphere's full of gas. That kind of looks like what Caleb has :)