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Mecca - Wikipedia
Mecca | History, Pilgrimage, Population, Map, & Facts
Kaaba - Wikipedia
Kaaba | Definition, Interior, Black Stone, & Fact | Britannica
Smarthistory – The Kaaba
Great Mosque of Mecca | History, Expansion, & Facts
Mecca – Travel guide at Wikivoyage
Mecca - Sacred Sites: World Pilgrimage Guide
The Kaaba (article) | Islam | Khan Academy
Makkah - Visit Saudi Official Website