The architecture of Iran has special features compared to the architecture of other countries of the world; features such as proper design, accurate calculations, proper cover layout, technical and scientific manners in the building, elevated porches, long columns and finally various decorations. These features represents the magnificence of Iranian architecture.
The shrine of Imam Reza in Mashhad is one of the most famous religious buildings in Iran.
The architecture used in the shrine of Imam Reza is considered as the pure Islamic art. This shrine includes dome,minarets, finials, and porches. 
Before the minarets were next to the mosques for saying adhan, they were used as guiding towers that guided travelers.