Echmiadzin Cathedral: Etchmiadzin Cathedral is the mother church of the Armenian Apostolic Church, located in the city of Vagharshapat (Etchmiadzin), Armenia. According to scholars it was the first cathedral built in ancient Armenia, and is considered the oldest cathedral in the world. The original church was built in the early fourth century between 301 and 303 according to tradition – by Armenia’s patron saint Gregory the Illuminator, following the adoption of Christianity as a state religion by King Tiridates III. It replaced a preexisting temple, symbolizing the conversion from paganism to Christianity. The core of the current building was built in 483/4 by Vahan Mamikonian after the cathedral was severely damaged in a Persian invasion. From its foundation until the second half of the fifth century, Etchmiadzin was the seat of the Catholicos, the supreme head of the Armenian Church.
As the main shrine of religious Christian Armenians worldwide, Etchmiadzin has been an important location in Armenia not only religiously, but also politically and culturally. A major pilgrimage site, it is one of the most visited places in the country. Along with several important early medieval churches located nearby, the cathedral was listed as a World Heritage Site by UNESCO in 2000.