The issue of “museumification” and preservation of historical-architectural monuments of different historical layers located on Armenia’s present-day territory is analyzed in this article. Exhibits in the open air and in the buildings of the museum reserves Erebuni, Shengavit, Karmir Blur, Metsamor, Zvartnots, as well as the museum of Etchmiadzin Cathedral, the oil mill of Tatev monastery, and the museum of Tigranakert in Artsakh have been considered. The activities that promote the conservation, comprehensive performance, and popularization of architectural monuments are presented at the end.