The museum stands at the foot of the Arin Berd hill, on top of which the Urartian Fortress Erebouni has stood since 782 BCE. The City-Fortress was excavated, some parts of the structure were reinforced and restored, and the fortress was turned into an outdoor museum. The city was built by Argishti I the King of Urartu in 782 BCE. The temple of God Khaldi occupied an important place in the fortress. The walls of the temple were decorated with numerous frescos. The museum houses 12,235 exhibits. It has two branches in Shengavit and Karmir Blur with 5,288 and 1,620 exhibits respectively in stock.