The largest church in the complex, the Cathedral of Surb Nishan, probably begun in 976, was completed in 991 by king Smbat. It is a typical example of tenth century Armenian architecture, its central dome rests on the four imposing pillars of the lateral walls. The outside walls are dotted with triangular recesses. A fresco in the apse depicts Christ Pantocrator. Its donor, the Armenian Prince Khutulukhaga, is depicted in the south transept (a transversal nave intersecting the main nave). The sons of the church's founder, Princes Smbat and Kurike, are shown with Queen Khosravanuysh in a bas-relief on the east gable. Apart from one or two minor restorations carried out in the eleventh and twelfth centuries, the church has retained its original character.

Sanahin Monastery is an Armenian monastery founded in the 10th century in the Lori Province of Armenia.The name Sanahin literally translates from Armenian as "this one is older than that one", presumably representing a claim to having an older monastery than the neighbouring Haghpat Monastery. The two villages and their monasteries are similar in many ways, and lie in plain view of each other on a dissected plateau formation, separated by a deep "crack" formed by a small river flowing into the Debed river.

French archaeologist, ethnographer and historian Jacques de Morgan, who was director of the Akhtala copper mines in the 19th century, excavated and discovered antiquities at the Akhtala fortress, including the discovery of antiquities (6000 BC). now it is preserved in Paris.