Imam Reza Shrine in city of Mashhad
Imam Reza was poisoned and died in  817 in Sanabad.
The place of his burial was named Mashhad ( the place of martyrdom)
Imam Reza is the only one of twelve Imams buried in Iran
Imam Reza shrine construction began in the 9th century.  It was rebuilt and redecorated by the order of Shah Abass of Savafid dynasty in early 17th century
Photo: by N. Kasraian
From:  Our Homeland Iran book