Imam Mosque At the end of the Imam Square is one of the most stunning buildings in Iran, the Imam Mosque. Two turquoise minarets flank the huge gateway (27m high). Behind it and slightly to the right is the main dome (52m high) of the prayer hall. It was built over a period of 26 years and was eventually completed in 1638. In Shah Abbas’ impatience to see it finished, he attempted to hurry up the work by adopting a new method of glazed tile work, known as haft rangi (of seven colours). As a result, some sections are decorated with the new style and some with the old and these ornate tiles take on a different hue according to the light conditions.