Is it worth the cost? That was my initial thought. We went to visit the Johnson Space Center (Space Center Houston) on March 8. We had heard it was the most visited attraction in the Houston area (I'm not sure the validity of it). We got there around opening time, 10 am. There were a lot of people there already (mostly school aged kids in groups). Main building for the Space Center wasn't all that impressive from an adult's point of view, but there were many things for children to do. A huge Pepsi playground, with slides, everything. There were lots of little space gadgets scattered about for them...