Chill out in Yerevan Green Belt.
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Աբովյան Փողոց
It's home to very few remaining Belle Époque period structures of Republican Armenia. Some gems of Art Nouveau, early Modern (constructivist and the like), and Moorish Revival style can be found in the backyards of Abovian, Nalbandian and Hanrapetutian streets. Most often they are in a very poor condition due to neglect. Hanrapetutian st. might get a special attention if you are not time constrained.
Yervand Kotchar Museum
Small museum dedicated to the eponymous sculptor and artist.
At the foot of the Cascade complex, which itself has many fountains, this sunken fountain with lots of seating is one of Yerevan's coolest spots to escape the heat of summer.
Holy Mother of God Kathoghike Church, Սուրբ Աստվածածին Կաթողիկէ Եկեղեցի
A tiny structure constructed in typical Armenian style. Katoghike means "cathedral"; the reason for the incongruity is that the original 13th century church had a much larger basilica attached to it in the 17th century - but that addition was demolished in 1936. In 2015 a new and much larger separate church was built next to Kathoghike, the cream colored St. Anna church.
The building is perhaps modeled after SemperOper of Dresden, however it is supposed to be double as beautiful as the Yerevan building is two sided: One side (entrance from the Theatrical/Freedom square) is home to Opera and Ballet Theatre, while the street side houses the Khachaturian Concert Hall. For music fans, attend cheap and excellent performances at the Opera or the Chamber Music Orchestra. If a national dance group is performing, don’t miss it.
A triangular park with a statue of the painter Martiros Saryan is where painters gather to sell their work. Many more on the weekend than on weekdays.