Sad Al-Saltaneh Carvanserai built by according   to Sad Al-Saltaneh's order (dead, 1325Hq), the     commander of Qajarie in Qazvin.The most     valuable part is it's four-leads that is formed     from two sides intersection,there is a tiling   dome over it, four semi-dome surround the   dome that it makes the space bigger. Sad Al-   Saltaneh Carvanserai by the area of 6.2 hectare   is one of the greatest commercial places in Iran.