I found a good free 3D program that can be used to make buildings for cities or wonders. Sketchup has been commercial for a long time but now you can get a free version of this program through google.
http://sketchup.google.com/
Anyway I hope this helps spur more creativity in the community.
http://sketchup.google.com/
Anyway I hope this helps spur more creativity in the community.