Etchmiadzin Cathedral - Credit: Wikimedia Commons
Etchmiadzin Cathedral () is the mother church of the Armenian Apostolic Church, located in the city dually known as Etchmiadzin (Ejmiatsin) or Vagharshapat, Armenia. It is usually considered the first cathedral built in ancient Armenia, and often regarded the oldest cathedral in the world. Read more on Wikipedia
Source: en.wikipedia.org