Need help with a couple of things

I can't seem to find the 'White Cross'. I believe it to be in the Crypts, but can't find it
. There are doors in Crypt three I can't open even tho I have plenty of keys
.Is it in one of those? Also, I can't figure out where to stand in the El Cairo sun thinking of the beauty of Dawn. Do I need this to proceed in the game? Could someone help me PLEASE
?


