The Temple of Garni is the only standing Greco-Roman colonnaded building in Armenia and the former Soviet Union. An Ionic pagan temple located in the village of Garni, Armenia, it is the best-known structure and symbol of pre-Christian Armenia. It is one of the most ancient landmarks in Kotayk and whole Armenia which has survived since pagan period. Historians attribute its erection to the ancient-Armenian king Trdat who adopted Christianity as official religion in 301. Although many scientists believe that it was constructed in the 1 st century AD.

Geghard is a medieval monastery in the Kotayk province of Armenia, being partially carved out of the adjacent mountain, surrounded by cliffs. It is listed as a UNESCO World Heritage Site with enhanced protection status.

Sevanavank is a monastic complex located on a peninsula at the northwestern shore of Lake Sevan in the Gegharkunik Province of Armenia, not far from the town of Sevan. Initially the monastery was built at the southern shore of a small island. According to an inscription in one of the churches, the monastery of Sevanavank was founded in 874 by Princess Mariam, the daughter of Ashot I (who became a king a decade later). The two churches of the complex, Surp Arakelots meaning the "Holy Apostles" and Surp Astvatsatsin meaning the "Holy Mother of God", are both cruciform plan structures with octagonal tambours. Both are quite similar in appearance. Adjacent are the ruins of a gavit whose roof was originally supported by six wooden columns.