Sunni Muslims and Shia Muslims agree on the three holiest sites in Islam being, respectively, the Masjid al-Haram (including the Kaaba), in Makkah; the Al-Masjid an-Nabawi, in Medina; and the Al-Masjid Al-Aqsa, in Jerusalem. Shia Muslims consider sites associated with Muhammad, his family members (Ahl al-Bayt), Shia imams and their family members to be holy. After the three holy cities of Islam (Makkah, Medina, Jerusalem), some of the most revered sites by Shias include Najaf and Karbala, in Iraq, and Mashhad and Qom, in Iran.

Holy sites accepted by all Muslims

Kaaba

Kaaba (Arabic: The Cube) is the most sacred site in Islam. It is surrounded by Masjid-al-Haram. During the Hajj period, the mosque is unable to contain the multitude of pilgrims, who pray on the outlining streets. More than 2 million worshippers gather to pray during Eid prayers. "And when We assigned to Ibrahim the place of the House, saying: Do not associate with Me aught, and purify My House for those who make the circuit and stand to pray and bow and prostrate themselves." "And when Ibrahim and Ismail raised the foundations of the House: Our Lord! accept from us; surely Thou art the Hearing, the Knowing:"

Holy sites by Shia Muslims

Imam Ali Shrine

The Imam Ali Shrine in Najaf is considered the holiest, which contains the tomb of Ali. He was the cousin and son-in-law of Muhammad. Ali is considered by Shia tradition to be the first legitimate caliph and the first imam due to the proclamation given by Muhammad. The site is visited annually by at least 8 million pilgrims on average, which is estimated to increase to 20 million in years to come. Adam and Noah are also buried within this mosque according to Shia Islam. Many Shia believe that Ali did not want his grave to be desecrated by his enemies and consequently asked his friends and family to bury him secretly. This secret gravesite is supposed to have been revealed later during the Abbasid Caliphate by Ja'far al-Sadiq who is believed by Shia Muslims, the sixth Shia imam. Most Shias accept that Ali is buried in the Imam Ali Mosque which is now the city of Najaf. Ja'far al-Sadiq, the sixth Shia imam, said that the Imam Ali Mosque is the third of five holy places: Mecca, Medina, Imam Ali Mosque in Najaf, Imam Husayn Shrine in Karbala, and the shrine of Fatima Masumeh in Qom. "God chose that land [Najaf] as the abode of the Prophets. I swear to God that no one more honourable than the Commander of the Believers [Ali] has ever lived there after (the time of) his purified fathers, Ādam and Nūh."

Imam Husayn Shrine

Imam Husayn Shrine in Karbala is the second holiest site for Shia Muslims. It contains the tomb of Husayn, the third Shia imam. It also contains the tombs of Ali al-Akbar ibn Husayn, Ali al-Asghar ibn Husayn, sons of Husayn; Ibrahim al-Mujab, grandson of Musa al-Kadhim and the martyrs of Karbala. The mosque stands on the site of the grave of Husayn ibn Ali, where he was martyred during the Battle of Karbala in 680. Up to a million pilgrims visit the city to observe the anniversary of Husayn ibn Ali's death. There are many Shia traditions which narrate the status of Karbala: "Karbalā, where your grandson and his family will be killed, is the most blessed and the most sacred land on Earth and it is one of the valleys of Paradise." "God chose the land of Karbalā as a safe and blessed sanctuary twenty-four thousand years before He created the land of the Ka'bah and chose it as a sanctuary. Verily it [Karbalā] will shine among the gardens of Paradise, like a shining star shines among the stars for the people of Earth." "Not one night passes in which Gabriel and Michael do not go to visit him [Husayn]."

Imam Reza Shrine

Imam Reza Shrine in Mashhad, Iran is the third holiest site for Shia Muslims, which contains the tomb of Ali al-Ridha, the eighth Shia imam. Ali al-Ridha is believed, by members of the Shia, to have been poisoned there upon the orders of Caliph Al-Ma'mun and the place was subsequently called, Mashhad ar-Ridhā (the place of martyrdom of Ali al-Ridha). By the end of the 9th century a dome was built on the grave and many buildings and bazaars sprang up around it. For years totalling more than a millennium, the mosque was destroyed and reconstructed several times. Today, Several important theological schools are associated with the shrine of the eighth imam. As a city of great religious significance, it is also a place of pilgrimage. Those who complete the pilgrimage to Mecca receive the title of haji, those who make the pilgrimage to Mashhad–and especially to the Imam Ridha shrine–are known as mashtee, a term employed also of its inhabitants. Over 25 million Muslims a year make the pilgrimage to Mashhad. It is generally considered to be the holiest Shia shrine in Iran. Shia sources quote several hadiths from the Shia Imams and Muhammad that highlight the importance of pilgrimage to the shrine. A hadith from Muhammad says:"One of my own flesh and blood will be buried in the land of Khorasan. God the Highest will surely remove the sorrows of any sorrowful person who goes on pilgrimage to his shrine. God will surely forgive the sins of any sinful person who goes on pilgrimage to his shrine."

Fatima Masumeh Shrine

The Fatima Masumeh Shrine in Qom, Iran contains the tomb of Fatimah bint Musa, sister of the eighth Shia imam, Ali al-Ridha. It is the forth holiest shrine in Shia Islam. The shrine has attracted to itself dozens of seminaries and religious schools.

Jamkaran Mosque

The Jamkaran Mosque in Qom, Iran is one of the primary significant mosques in Jamkaran. Hassan ibn Muthlih Jamkarani is reported to have met the Shia's 12th imam, Muhammad al-Mahdi. In the rear of the mosque, there is a "well of requests (of prayers)" to be passed on to God (Allah). Pilgrims tie small strings in a knot around the grids covering the holy well, which they hope will be received by the Imam Mahdi.

Al-Sahlah Mosque

The Al-Sahlah Mosque in Kufa, Iraq is said to be the future home of the Twelfth Shia imam, Muhammad al-Mahdi.

Sayyidah Zaynab Mosque

The Sayyidah Zaynab Mosque in Damascus, Syria contains the tomb of Zaynab bint Ali, the daughter of Ali and Fatimah, and the granddaughter of Muhammad.

Al-Abbas Shrine

The Al-Abbas Shrine is located directly across from the Imam Husayn Shrine, and contains the tomb of Abbas ibn Ali, son of Ali and brother of Husayn. Millions of pilgrims visit the shrine and pay homage to it every year. The real grave of Abbas is beneath the masoulem, and is present in the shrine. Emperors and kings of various dynasties have offered valuable gifts and gems to the shrine of Abbas. It was designed by Persian and Central Asian architects. The central pear shaped dome is an ornately decorated structure. On its sides stand two tall minarets. The tomb is covered with pure gold and surrounded by a trellis of silver. Iranian carpets are rolled out on the floors.

Sayyidah Ruqayya Mosque

The Sayyidah Ruqayya Mosque in Damascus, Syria contains the tomb of Sukayna bint Husayn, the youngest daughter of Husayn ibn Ali, often referred to by her title: "Ruqayya".

Al-Kadhimiya Mosque

The Al-Kadhimiya Mosque in Baghdad, Iraq contains the tombs of Musa al-Kadhim, seventh Shia imam and Muhammad al-Jawad, ninth Shia imam. Some consider the mosque the third holiest in Shia Islam.

Al-Askari Shrine

The Al-Askari Shrine in Samarra, Iraq contains the tombs of Ali al-Hadi, tenth Shia imam and Hasan al-Askari, eleventh Shia imam. Hakimah Khātūn, sister of Ali al-Hadi and Narjis, mother of Muhammad al-Mahdi are also buried within the mosque. The cellar from which the twelfth or "Hidden" imam, Muhammad al-Mahdi, disappeared from view is also found within this mosque. At the time of the Al-Askari bombing in Samarra, it was reported that the mosque was one of Shia Islam's holiest sites, only exceeded by the shrines of Najaf and Karbala, making it the third holiest Shia site.

Mosques associated with companions of Muhammad and the Shia imams

Tombs of other family members of Muhammad

Holy sites specific to other Shia Muslims (non-Twelvers)

Cemeteries

Al-Baqi'

Al-Baqi' (Jannat al-Baqī) is a cemetery located across from Al-Masjid al-Nabawi in Medina, Saudi Arabia. It is the oldest and first Islamic cemetery. Holy figures of Shia buried here include

Jannat al-Mu'alla Cemetery

The Jannat al-Mu'alla cemetery in Mecca, Saudi Arabia contains the graves of many relatives of Muhammad, held in high esteem by the Shia, including:

Bab al-Saghir Cemetery

The Bab al-Saghir cemetery in Damascus, Syria contains the graves of many relatives of Muhammad as well as sites related to the Battle of Karbala. Some of the figures laid to rest here include:

Other tombs for the family of imams

There are many tombs of the various descendants of the imams (often called imamzadeh). Some of them include:

Tombs of Biblical prophets

Other places associated with Muhammad