If the Muslim is against idol worship, why do they circle around a black stone?

Update: "The Great Mosque is the House of Allah"
I didn't know that Allah lives inside a mosque. Do you have a photo of him?
Update 2: "They don't worship the Black stone."
Then, why do they circle around it several times?
Update 3: "The items inside of the Kaaba are from the heavens and Father Adam brought it with him."
Source please.
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