I found a easter egg on de_chateau just a few minutes ago when I fucking around in noclip mode when you die.
This is the door you need to enter when you die (main courtyard, the one with all the hedges around it and windows overlooking the place)
The Doorway part II
Easter Egg!
Sorry about the shitty quality, ImageShack bitched at me for having images over 1MB, so I used Photoshop CS to compress them some.
EDIT: Alright, they should work now.