The Kaaba
Quick Answer
Safety, an esteemed leader, a righteous minister, or glad tidings of Hajj.
Classical Interpretation (Ibn Sirin)
Seeing the Kaaba in a dream signifies safety from fear and enemies. It can also represent a great scholar, a just ruler, or one's own parents. Entering the Kaaba means gaining authority or entering into safety. Praying facing the Kaaba confirms one's steadfastness in religion. Seeing the Kaaba destroyed or in the wrong place is a major warning regarding the leadership of the Muslims.
Quranic Context
"And [mention] when We made the House a place of return for the people and [a place of] security. (Quran 2:125)"