According to the Orthodox Church Axum is the holiest city of Ethiopia. The Original Ark of the Covenent is said to be in the area. It is also the place where Christianity was declared the national religion in the fourth century. The Ark is supposed to be somewhere in the grounds of the church St. Mary of Zion which was built in the 17th century. The museum at the church has a fine small collection of bibles, crosses and crowns. Close to the church is Axum’s ancient stelae field the only remains of the city’s past glory. Stelae are huge, carved pillars made from single blocks of granite. The highest of those still standing is 24 meters.