Ancient Yerevan starts from the hill of Arin-Berd in south-east of Yerevan, where archeologists have restored the ruins of the ancient fortress of Erebuni. The name Yerevan itself is derived from Erebuni.
Erebuni was founded by Urartian King Argishti I in 782 BC. It was built on top of a hill called Arin-Berd overlooking the Arax River Valley to serve as a military stronghold to protect the kingdom’s northern borders. (Arax River is a river located in and along the countries of Turkey, Armenia, Azerbaijan, and Iran. Its total length is 1,072 kilometers.)
Argishti I was the sixth king of Urartu, reigning from 786 BC to 764 BC. A son and the successor of Menua, he continued the series of conquests initiated by his predecessors. Victorious against Assyria, he conquered the northern part of Syria and made Urartu the most powerful state in the post-Hittite Near East. He also expanded his kingdom north to the Lake Sevan conquering much of Diauehi and the Ararat Valley. Argishti built the Erebuni Fortress in 782 BC and the fortress of Argishtikhinili in 776 BC.
There were a lot of tourists. They just climb the hill, look at the town of Yerevan, take some souvenir pictures and leave while chatting. The excavation still continues.
I did not know the history of Caucasus, but it is very interesting.