Googad Citadel which is located near the city of Golpayegan (in Isfahan province) dates back to about four centuries.
The only written document that has been left from the citadel belongs to about 130 years ago.
This document indicates that half of the citadel was built by a person named Ali Khan who gave his share of the citadel to his wife as dowry.
According to K.domaindlx webstie, Googad Citadel and the city of Golpayegan was located en route Silk Road. This is why the citadel was called Alikhani Citadel for some time.
Golpayegan has a minaret which is about 18 meters high and it was used as a guide for passengers in the past.
The citadel was used as a caravansary for businessmen during peace time.
Aqa Mohammad Khan, the Qajar king, has also spent several days in the citadel while he was returning from one of his wars.
The citadel is currently used as a luxury hotel nowadays.
A room currently used as a special suite was designated for kings.
Doves acted as an alarm system for of the citadel so that special openings were considered for the doves to settle in the citadel’s wall and whenever they heard strange sound they also began to make noise.
Reference:
http://notes-on-Iran.blogspot.com