Final answer:
The Kaaba is a cubical stone building in the courtyard of the Great Mosque at Mecca and is regarded by Muslims as the House of God. It is an important religious site in Islam and the direction towards which all Muslims pray.
Step-by-step explanation:
The subject of this question is History. The cubical stone building in the courtyard of the Great Mosque at Mecca is called the Kaaba. It contains a sacred black stone and is regarded by Muslims as the House of God. The Kaaba is an important religious site in Islam and is the direction towards which all Muslims pray.