During its long history, this city was occupied by many tribes, and its name has been mentioned in many historical books. In the beginning of the fourth century, the city of Semnan was counted as a part of the territory of Al-Ziar dynasty, and after the decline of this dynasty, it was occupied by Al-Bowayh. In this period, the city of Qomis was a part of the region of Daylam. In the year 427 After the Hegira (AH), the Ghaz Turks destroyed this city severely, and it was once again destroyed by the Mongols in the year 618 AH. From the many significant historical remainings of the city, one can mention the followings:
hThe Minaret of the Saljuk Period which contain an inscription written by the Kufi calligraphy on its brick walls.
Khanqah and Tomb of Shaykh Ala’ol-Dawleh Semnani which is located in Sorkheh village.
The building is being regarded to Mongols’ period.
The Friday Mosque which its building history belongs to the year 828 AH (the Shahrokh period).
Shah Abbas Karvansera which is located in Lasjerd village, and it has to somewhat remained undistroyed.
The Sultani Mosque which was built by Fath-Ali shah Qajar.
The Gate of the Semnan Citadel which is of the Qajar period remainings.
The Natural and Historical Remaining of Darband which is located 21 kilometers far from the city of Semnan and it is very interesting for visitors.