This is where you would have started had this D3 dev team stuck with the Blizz north-style of the art in the game. This is where you would have begun in the game, as the player. The very first screen you would have seen in D3 would have been this room.

You can see some alternate shots here:

http://diablowiki.net/Cathedral

But this is the actual model. A nice piece of history preserved.