Etchmiadzin City used to be the ancient capital of Armenia. Since 4th century, it is the largest religious center, the residency of Catholicos of All Armenians. Etchmiadzin Cathedral. The cathedral is one of the ancient churches in the Christian world, included in the UNESCO World Heritage List (2000).It is the center of Armenian Apostolic Church. It was founded in 301 A.D. by St. Gregory the Illuminator. Later, it was rebuilt and currently it stands as a complex including the Cathedral, Spiritual Academy, residency of the Catholicos of all Armenians, Synod of Armenian Church and a library. The museum of the Cathedral, located behind the Altar, has collection of religious artefacts about Holy Mass, subjects made of gold, silver, precious stones, decorations, colossal silver boiler for making the myrrh and legendary Holy spear.