Masjid al-Haram.

Masjid al-Haram.

Al-Masjid al-Ḥarām (Arabic: المسجد الحرام‎, pronounced [ʔælˈmæsdʒɪd ælħɑˈrɑːm], "The Sacred Mosque") or the Grand Mosque[1] surrounds Islam's holiest place, the Kaaba. It is located in the city of Mecca and is the largest mosque in the world. Muslims around the world turn toward Kaaba while performing any prayer. One of the Five Pillars of Islam requires every Muslim to perform the Hajj pilgrimage, at least once in his or her lifetime if able to do so, including circumambulation of Kaaba.
The current structure covers an area of 356,800 square metres (88.2 acres) including the outdoor and indoor praying spaces and can accommodate up to four million worshipers during the Hajj period, one of the largest annual gatherings of people in the world.
According to Islamic tradition the very first construction of the Kaaba, the heart of the Masjid al-Haram, was done by Adam. Allah says in the Qur'ân that this was the first house that was built for humanity to worship Allah. As time continued the Kaba was demolished completely and forgotten.
With the order of the God [Quran 22:26], Ibrahim and his son Ishmail found the original foundation and rebuild the Kaaba [Quran 2:125] [Quran 2:127] in 2130 BCE. Hajar-ul-Aswad ,the Black Stone situated on the lower side of the eastern corner of the Kaaba, is believed to be the only remnant of the original structure made by Ibrahim. Muslim belief also places the story of Ishmael's mother search for water in the general vicinity of the mosque. In the story, Hagar runs between the hills of Safa and Marwah looking for water for her infant son until God eventually reveals her the Zamzam. The "Zamzam well" and "Safa and Marwah" are structures in the Masjid al-Haram.