Archaeologists found that the presence of column in Iranian architecture goes back to six millenniums ago.

After discovering several bases in Mousian Hill, 150 km northwest of Susa, they now believe the importance of erecting columns was recognized 6,000 years ago, though the oldest ever discovered Iranian site featuring columns is Hassanlou Fort, south of the Uremia Lake and near the city of Naghade.

 

The fort is built based on architecture principles and is made of stones, bricks and plaster.
Beside Hassanlou Fort, one can cite residential pits dug out in mountains, some dating back to the Medes dynasty, frequently using columns in their buildings.

 

One of the characteristics of these pits is arch corridors and columns used at the mouth of them. Many of these pits also showcase engraved scenes on the walls, depicting prayer rituals in ancient Persia (now called Iran).