Yesterday I was exploring this tomb (the one under the terra cotta army) and I sort of got stuck and didn't know what to do next and well, to cut a long story short (ahem, it was late and I was weak), I went into building mode to take a quick peek around. And then I noticed this room:
But..., I don't quite understand how she'd ever be able to get there? It's black in playing mode obviously because she hasn't entered it yet. I see no ways to enter it though. Is it an error? A room that was accidently left by the creators? Or is there actually a way to get there? As you can see there is a toggle attached to it (the green arrow, coming from a tile in one of the other chambers).