After looking at Vincent Mayeur‘s new castle using the CryEngine, why not check out the other pieces in his portfolio (perhaps the body of work that landed him his role at Crytek UK). I think these are all using the UDK engine actually, these are just so impressive to me in showcasing what one person can achieve learning the tools (quite a few of them) to bring environments like these into being. Go to the site to see plenty more pics of each project.

[Vincent Mayeur environments via his site]