It houses the tomb of Imamzadeh Zeyn al-Din (AS), a descendant of Imam Sajjad (AS). The holy site is located in the historical village of Hesar Saydlar in Ahar County, in the heart of the pristine and beautiful slopes of Fandogloo Forest Park, 21 kilometers from the Ahar-Meshginshahr road.
In addition to being a pilgrimage site, this place has pristine nature and a pleasant environment for tourism and recreation, annually welcoming thousands of pilgrims and tourists from all over Iran.