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Saudi Arabia Kaaba
Kaaba is the holiest building in Islam. Kaaba is surrounded by the greatest Mosque in the world. It is called the Grand mosque (or Al-Majid Al-Haram).
Islam
The Kaaba in Mecca, Saudi Arabia.
What you're referring to [what I'm guessing you're referring to anyway] is the Kabah. Kabah is symbolised as the House of God. Muslims don't worship the 'black box'. They pray towards the direction of Kabah [if it makes sense?]
Islam. Since Kaaba is the place where they face five times a day while offering their prayers.
Al-Kaaba, Makka.
Islam.
Muslims consider the Kaaba a sacred place.
The holy site of Islam is located in Mecca, Saudi Arabia. Specifically, the Kaaba is located there (it's a giant black cube). The Kaaba is the most sacred and holy site in Islam. When Muslims pray, wherever they are on the globe, they pray in a certain direction so that way they are facing the Kaaba. They once faced Al-Aqsa (another holy site in Islam) Jerusalem as the direction of prayer.
Muhammad was careful not to destroy all objects that were sacred in Arabia before Islam
Muhammad was careful not to destroy all objects that were sacred in Arabia before Islam