The Haram in Mecca is the world's largest mosque and is the place where we can find the Kaaba.
The Kaaba was built by Ibrahim (Abraham) and Ismail as a house of monotheistic worship thousands of years ago.
Muslims do not worship the Kaaba, but it is Islam’s most sacred site because it represents the metaphorical house of God and the oneness of God in Islam.
Pilgrims across the world come to Mecca to see the Kaaba so this mosque has been renovated such as it can welcome close to 2 millions individuals.