The Imam Reza shrine (Persian: حرم امام رضا, romanized: Haram-e Emâm Rezâ, lit. 'Sanctuary of Imam Reza'), located in Mashhad, Iran, is an Islamic shrine containing the remains of Ali al-Rida, the eighth imam in Twelverism. It is the largest mosque in the world by area. Also contained within the complex are the Goharshad Mosque, a museum, a library, four seminaries, a cemetery, the Razavi University of Islamic Sciences, and other buildings.
The complex is a tourism center in Iran and has been described as "the heart of the Shia Iran" with 25 million Iranian and non-Iranian Shias visiting the shrine each year, according to a 2007 estimate.

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