I've been building some of the location for Paizo's Legacy of Fire Pathfinder series using Sketchup 7. Turns out you can use Ruby plugins to output the models in other formats without having to buy the Pro version. But the Pro version certainly works better!!!
Anyway, here's an example of the Monastery in the Howl of the Carrion King (PF19).
There are more pics on my MediaFire site
and the .skp model free for non-commercial use. My only requirement is that if you improve it (like better textures, etc.) that you make it available to others to use.
Interestingly, when I posted on Paizo's forums the model got a huge collective yawn. I guess there's not much interest in 3d models of adventure sites in the general population. I've got new pictures set in a VUE
generated environment that I'll post over the weekend if any are interested.