There are mainly three Holy sites in the Islāmic Sunni traditions. The Ka'bah is considered the Holiest site, followed by Masjidun Nabawi (The Prophet's Mosque) as the second, and the third holies is Masjidul Aqsā (The Farthest Mosque).

Al-Masjid al-Harām "The Sacred Mosque"), is a large mosque in the city of Mecca, and the largest in Islam. It surrounds the Kaaba, the place which all Muslims turn towards each day in prayer, considered by Muslims to be the holiest place on Earth. The mosque is also commonly known as the Haram, The Grand Mosque or Haram Sharif^{[ citation needed]}.

The current structure covers an area of 356,800 square meters including the outdoor and indoor praying spaces and can accommodate up to 820,000 worshippers during the Hajj period. 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 taraweeh and Eid prayers. [1] [2]

According to the teachings of Islam, God in the Qur'an used the word Mosque when referring to the sites established by Abraham and his progeny as houses of worship to God centuries before the revelation of the Qur'an. The first of these spots is Masjid al-Haram in Mecca and the second is Al-Aqsa Mosque in Jerusalem. Before Mecca and Jerusalem came under Muslim control between 630 CE and 638 CE, the site of the Kaaba, which was supposedly established by Abraham and Ishmael, was used by non-Muslim Arabs who worshipped multiple gods.

And when We assigned to Abraham the place of the House (Kaaba), 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.

—  Qur'an, ^{[ Quran  22:26}

And when Abraham and Ishmael raised the foundations of the House (Kaaba): Our Lord! accept from us; surely Thou art the Hearing, the Knowing.

—  Qur'an, ^{[ Quran  2:127}

Al-Masjid al-Nabawi (Arabic: المسجد النبوي, pronounced [ælˈmæsdʒidæˈnːæbæwiː]) or the Mosque of the Prophet, located in Medina, is the second holiest site in Islam.

The edifice was originally Muhammad's house; he settled there after his Hijrah (emigration) to Medina, and later built a mosque on the grounds. He himself shared in the heavy work of construction. The original mosque was an open-air building, with no gender separation. The mosque also served as a community center, a court, and a religious school. There was a raised platform for the people who taught the Qur'an. The basic plan of the building has been adopted in the building of other mosques throughout the world.

The original mosque was built by the Islamic prophet Muhammad. Subsequent Islamic rulers greatly expanded and decorated the mosque. The most important feature of the site is the green dome over the center of the mosque, where the tomb of Muhammad is located. Constructed in 1817C.E. and painted green in 1839C.E., it is known as the Dome of the Prophet. ^[1] Early Muslim leaders Abu Bakr and Umar ibn al-Khattab are buried beside Muhammad.

Hala Sultan Tekke ( Arabic: هالة سلطان بزيارة, Greek: Χαλά Σουλτάν Τεκκέ), or the Mosque of Umm Haram, is a very prominent Muslim shrine near Larnaca, on the island of Cyprus. Umm Haram was the Islamic prophet Muhammad’s ' wet-nurse' and the wife of Ubada bin al-Samid. Most accounts establish a connection between the site and the death of Umm Haram during the first Arab raids on Cyprus under the Caliph Muawiyah between 647 and 649, which were later pursued throughout the Umayyad and the Abbasid periods. According to these accounts, Umm Haram, being of very old age, had fallen from her donkey and died during a siege of Larnaca. She was buried near the Larnaca Salt Lake and her grave became a sacred shrine. The shrine, and later the mosque, was named after her.

The Hala Sultan Tekke complex is composed of a mosque, mausoleum, minaret, cemetery, and living quarters for men and women. The term tekke (or convent) applies to a building designed specifically for gatherings of a Sufi brotherhood, or tariqa, and may have referred to an earlier feature of the location. Hala Sultan Tekke is a listed ancient monument.

While being acknowledged as a holy site for Cypriot Muslims, ^{[2] [3] [4]} the mosque has also been described by secular contemporary sources as being revered by all Muslims. ^{[5] [6] [7] [8]} In an assessment of the environmental and cultural assets of Cyprus, Professor George E. Bowen, a senior Fullbright scholar at the University of Tennessee, is quoted as referring to the Hala Sultan Tekke as the third holiest place for Muslims in the world. ^[9] This view has been echoed by other sources ^{[10] [11] [12] [13]} including the United Nations Development Programme in Cyprus ^[14] and the Cypriot administration's Department of Antiquities. ^[15] Others, however, describe the site as fourth most important. ^{[16] [17] [18]}

The Quba Mosque (Quba' Masjid or Masjid Quba, Arabic: مسجد قباء) just outside Medina, Saudi Arabia, is the first Islamic mosque ever built. Its first stones were positioned by Muhammad on his emigration from the city of Mecca to Medina and the mosque was completed by his companions. Muhammad spent more than 20 nights in this mosque (after migrating) praying qasr (a short prayer) while waiting for Ali whose house was behind this mosque. Muhammad used to go there, riding or on foot, every Saturday and offer a two rak'ah prayer. He advised others to do the same, saying, "Whoever makes ablutions at home and then goes and prays in the Mosque of Quba, he will have a reward like that of an 'Umrah." This hadith is reported by Ahmad, Nasa'i, Ibn Majah, and Al-Hakim.

• Mount Uhud
• Jannat al-Baqi
• Cave of Hira
• Mount Sinai

• Aghaie, Kamran Scot (2004). The Martyrs of Karbala: Shi'i Symbols and Rituals in Modern Iran. University of Washington Press. ISBN 0295984481
• Majlisi, Mohammad Baqer. Bihar al-Anwar V.97.(In Arabic)
• Shimoni, Yaacov & Levine, Evyatar (1974). Political Dictionary of the Middle East in the 20th Century. Quadrangle/New York Times Book Co.
• Zabeth, Hyder Reza (1999). Landmarks of Mashhad. Alhoda UK. ISBN  9644442210.