Not a secret as it’s easily accessible and noticeable but if you haven’t booked a room yet, on deck 8, if you use the forward elevators and walk back through the hallway, there are little windows to the open lobby atrium. They have glass but are IMO a nice little difference. I’d imagine they are on at least 7 and 6 too but don’t know about any lower. Makes a nice change to walking back through the long hallway.