The Caravanserai of Sa'd al-Saltaneh is a large Caravanserai located in the city of Qazvin in Qazvin Province of Iran. Built during the Qajar era, the caravanserai is one of Persia's best preserved urban caravanserais. The builder (patron) of this large caravanserai was a person by the name Sa'd al-Saltaneh Isfahani for whom the caravanserai is named after.
The caravanserai is built on a square plan, has 4 iwans facing a courtyard. The interiors are decorated with Muqarnas and Rasmi bandi. The Hujrehs, or the rooms for the travelers, are situated one meter above the courtyard ground level. The Hashti behind the southern iwan has the largest gonbad, with 4 semi-domes adjacent to it. Wikipedia