The article discusses the parts of Ghevond Alishan's fundamental works related to architectural heritage. Our goal was to reveal the approaches and research methods that Alishan Armenologist was guided by when presenting the architectural heritage. All the types of architectural monuments and groups of monuments (such as settlements, cities, fortresses, people's houses, monastic complexes, churches, engineering structures) were observed, to which the great scientist referred. The article singles out the important directions of architectural heritage research. The important mission of Alishan's research, both for its time and in general, in the archiving, comprehensive research, popularization and transmission of the Armenian architectural heritage was appreciated.