Space Center Houston consists of a museum type building, a tram ride to a building with a Saturn 5 rocket, and two optional (extra cost) tram tours to the mission control building and the astronaut training site. The two for-pay tours are by reservation only. The museum is full of NASA displays, including video displays, and there is daily in-person programs. Unfortunately the place was literally overrun by kids on the day we were there (a Friday afternoon) . Given the hoard of kids it was impossible to comfortably examine the displays. We were too late to reserve places on the optional and pricey tram tours, which used to be included in the general admission. If you are really into space exploration or have a child (who can read explanations on displays) who is really into space engineering and exploration (no sci-fi here) then this may be a good experience for you.