On 9 September 1919, the National Assembly of Armenia founded the History Museum of Armenia. The museum opened to visitors on August 20, 1921. Its first director was Yervand Lalayan.
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2025
On September 21, Independence Day of Armenia, the building of Alexander Spendiaryan National Academic Opera and Ballet Theatre was unveiled with new lighting.
2011
On September 16, the new complex of "Zvartnots" International Airport was opened.
