Hajj: The annual pilgrimage to Mecca that every able-bodied Muslim is required to complete at least once in their lifetime.
Kaaba: A sacred building located in the center of Masjid al-Haram (the Great Mosque) in Mecca. It is believed to have been built by Abraham and his son Ishmael.
Medina: Another important city in Islam, located in present-day Saudi Arabia. It served as the first capital of the Islamic state after Muhammad's migration from Mecca.