This is a small section of very tall wall and one of the towers around Gogad Caravansary located in Mahallat in the province of Esfehun Nesfe Jahan.

As you would see there are lots of holes on the wall and on the tower which had a special purpose.

>>> CAN YOU GUESS what was the PURPOSES of these holes?
(I should mention that once I heard the answer from a local leader about purpose of those holes, I admit the high mentality of Persian Empire and it's Governors!!!!