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The three holiest sites in Islam are: the Masjid al-Haram, including the Kaaba, in Mecca, as the holiest site; the Al-Masjid an-Nabawi in Medina, as the second holiest; and the Al-Aqsa Mosque compound, in Jerusalem, is Islam's third holiest site.
Both the Umayyad Mosque in Damascus, Syria, and the Ibrahimi Mosque in Hebron, Palestine, have been revered as "the fourth-holiest site in Islam".
In Shia Islam, after the first four sites, the Imam Ali Mosque in Najaf, the Imam Husayn Shrine in Karbala and the Fatimah Masumeh Shrine in Qom are the holiest sites. For Sufi Muslims, after the first four sites, Mazar Ghous in Baghdad, Iraq, is the holiest site, followed by Data Darbar in Lahore, Pakistan. Sunni Muslims consider the Omar ibn al-Khattab Mosque and Abu Bakr Mosque very holy. There are also other sacred sites in Mecca that Muslims performing Hajj visit, namely Mount Arafat and Muzdalifah.