Caravanserai of Sa d al-Saltaneh was built at the instigation of Sa d al-Saltaneh (died in 1907 AD), the then Qajar governor of Qazvin.Caravanserai of Sa d al-Saltaneh is the biggest urban caravanserai in Iran and one of the few Iranian caravanserais that contains several bathrooms, saray, arcade, shotor khan, chahar souq, Rasteh, mosque, tea house and so on. This caravanserai functioned as a trade house