The Imam Reza Shrine in Mashhad is the main center of religious tourism in Iran, attracting millions of pilgrims each year who visit to experience its spiritual atmosphere. Renowned for its exquisite mirrorwork and Islamic architecture, it is considered one of the most beautiful religious sites in the world. Due to its historical, artistic, and architectural significance, the Astan Quds Razavi complex was officially registered as a national heritage site of Iran on January 5, 1932, under registration number 140.