I spent a quite a few hours on this. I hope you enjoy. I know I certainly loved building it. I wish it had been better but some early decisions led to some problems and this is what I ended up with. I think that it should be fairly playable though, thanks to the excellent game its running on.
Anyways thanks to iNiT for getting me started. We both sat down one day and came up with the basic idea for a prison and the basic layout. He also built the towers that you see.
http://mayang.com/textures/index.htm - the excellent free texture resource
http://www.greylight.com/main.html - for the great skybox
levelart.net for the great resources and numerous other websites that graciously provided tuts
and of course, Frozen Sands, for this great game
and Id for the great game its built on