I spent a long time in the the Karaağalar’s (Black Eunuch’) Courtyard. It has a colonnade on one side (left, when coming from the previous Hall with the fountain). Behind that colonnade are the rooms of the eunuchs. Again this was reconstructed (1668-9) after a 1665 fire. At its end is the Cümle Kapı, the Main Gate, into the harem proper, leading to a second guard room.
One of several shots looking towards the Cümle Kapı, the Main Gate, into the harem proper, leading to a second guard room. See the first picture in this series to get orientated. Most pictures are of the Colonnade and the wall at that side, the other side was rather plain.