What program for complete 3D world modeling? Or large map?

Can Vue do this? This would be for a game. Very large map, like 100 miles squared.

Is this possible to render or could proximity only be rendered while in a game?

Can Bryce do this? What would be the best program to use?

Vue is very powerful for large pieces of terrain. I don't know if there is something better. I tested it once and I have to say it works nicely. Download trial and test it yourself. It's very intuitive so there is no problem to do some quick tests.

I have done some experiments to make large scenes and maps doing 3dsmax. It works good, give it a try.