Gregory Estepanos Church is one of the ancient buildings of Hamadan city that its antiquity dates back to 335 years ago. This church is located at the historic yard of ancient Hegmatane hill.
Inside of the church there are four circle pillars which are attached to each other with zigzag arches. Around of church's adytum is covered with chalk and nowadays some layers of that are taken.
The inner decoration of this church was brick-made and the outside decoration was sun-dried brick and it has also false arches with crescent arc for beautifying.