4th century Armenian Cathedral of Etchmiadzin
The Etchmiadzin Cathedral is the oldest state-built church in the world. The original vaulted basilica was built in 301-303 by Saint Gregory the Illuminator when Armenia became the first officially Christian country in the world. According to the 5th-century Armenian annals, St. Gregory had a vision of Christ descending from heaven and striking the earth with a golden hammer to show where the cathedral should be built. Hence, the patriarch gave the church and the city the new name of Echmiadzin, which may be translated as “the place where the Only Begotten descended”.