I noticed this as I ran through the portal opens in the underdark. this place is so big that the drow use portals to navigate around the ziggy. and from the outside it is impressive looking up at the towering structure. however during the quest line (and this is more obvious during the portal opens because you actually teleport around) there are no windows letting us observe where we are in relation to the outside.
this could have been a HUGE bonus in the portal opens. if when we had gone through the portals there had been windows or balconies we passed that let us look out and see our transition through the city and that we were in fact moving great distances culminating with our showdown on the very peak of the ziggy.
it just feels like a missed opportunity in that quest as well as many others that can be the difference in a memorable location and quest, instead of just another bleak dungeon with an objective.
windows please ^_^