Texture inside of mesh in cycles

Hi Blender Artists. Ok I’ll be the first to admit that I don’t have the first clue as to where to look for something like this. Anyway, I’ve been modelling a scene that has quite a large castle. I know, another castle in Blender. What can I say, I like doing architecture. So eventually, I’d like to animate this scene and go inside my castle. So I was wondering if it is at all possible to use different textures on both sides of a mesh? Think of a cube that has a texture on the outside faces and another texture on the inside of the cube. Any help is appreciated. I’m using Cycles for this and would like to continue to do so. Thanks again.

So I was wondering if it is at all possible to use different textures on both sides of a mesh?
Use a Geometry node to control different materials on front and back faces. http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/More#Geometry

Oh no kidding, thanks Richard. I didn’t know about the Geometry node. Thanks for the link.