Arabic Masjid al-Nabi. First mosque in Islam, originally built by the Prophet Muhammad when he moved from Mecca to Medina, both in Arabia. Originally an enclosure marked as a special place of worship and congregation. A small part of the space was used to house Muhammad and his family. Upon his death, Muhammad was buried in the mosque. The original structure was rebuilt and expanded several times. It served both as a model for all later mosques and as the second most sacred site in Islam after the Kaaba sanctuary in Mecca. Though it is not obligatory, most Muslims include a visit to the Mosque of the Prophet as part of the pilgrimage rites to Mecca.
See also Kaaba