Besides its almost 9 meter high cupola with beautiful stalactite work, the colourful decorations and fine stone ornaments of the monument bestow a particular artistic charm on it. The monument bears great resemblance to the Tower of Ala ad-Din in Varamin, and has two separate rooms, built inside the tower. Its main cupola is coupled by two smaller ones. Hence the popular name Seh Gonbad, under which it is generally known

The present monument is believed to have originally been the site of the famous Azargashasb Shiz fire-altar and the birth place of Zaroaster, and its construction has been attributed to the Parthian and Sassanian sovereigns. In the central part of the hill there is a large pool built of stone for water storage purposes. During the 1970s a joint Irano-German excavation mission was involved in scientific investigations at the site and discovered a number of remains belonging to the Sassanian and Moghul periods.

The most important part of the Takht-e Suleiman ruins is that which comprises the entrance gate, the entrance door to the Azargashasb fire-altar, the fortification towers, the walls of the complex, the Sassanian ivan ( repaired during the reign of Moghuls), the central pool of the fire-temple, and a number of Islamic structures. From the view point of construction and architecture, the monument is highly remarkable. Adjoining the site are the ruins of Takht-e Bulqais and Suleimans dungeon (Dakhmeh-ye Zendan-e Suleiman).

 There is a House of Pearls named after the many white pearls and shells that were found there; these probably came from the Persian Gulf and the Indian Ocean islands. Craftsmen and merchants took refuge there in times of war, abandoning their houses outside the walls. It is best known for a gold bowl with relief decoration of weather gods and scenes from the mythology of the Hurri unearthed during the summer of 1958. This had been looted about 800 BC by soldiers from Urartu ( a kingdom adjoining Lake Van, to the east) who, however, were killed by the collapse of a burning roof before they could escape. The bowl is related artistically to the finds from Marlik and Ziwieh.