Sad Al-Saltaneh Karvansara 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 Karvansara by the area of 6.2 hectare is one of the greatest commercial place in Iran.