Du’a made inside the Ka’bah
The Ka’bah is a sanctuary that has no comparison in the entire world. The du’a of one who prays inside the hijr is considered as being made inside the ka’bah, as it is part of the house (Baitullah). [This is the semicircle to the right of the Ka'bah if you face the door, opposite to the Yemeni corner and the Black stone wall.]
Usamah ibn Zayd narrated, ‘When the Prophet (salAllahu alayhi wasalam) entered the House (Ka’bah), he made du’a in all of its corners [Muslim 2: 968 and others]