The last stop of the tram tour of NASA was the Rocket Park where rockets which were built but never launched are kept on display. The most notable among the rockets was the Appollo VI which was built to go to Moon but never launched because the US congress closed down the mission.
Here are some pictures of the same. Enjoy!!!

Rocket on display

Engines of the Appollo, impressive indeed

This is one huge rocket!!!

This is one huge rocket!!!

Engines of this rocket - another view