The castles of Bandar Langeh region were generally built for the life of local rulers. Kalat Castle was also built for the life of Sheikh Suleiman al-Hammadi.
The buildings of this complex are one of the most beautiful Islamic historical monuments in Iran in the Safavid era and is one of the most important ancient monuments in the country.
Blue Mosque according to the inscription on its entrance; It was built in 870 AH, during the reign of Sultan Jahanshah, the most powerful ruler of the Qara Quyunluyan dynasty.
One of the important caravanserais located in Semnan province and south of Garmsar is "Ain al-Rashid" which is located a short distance from Ghasr-e Bahram caravansary.
There are such caravanserais in Iran and in many provinces of central Iran, the most important of which is the Marnjab caravanserai, which is located in Isfahan province and on the edge of the beautiful Marnjab desert.