The church measures about 99 meters (325 ft) long and 22.7 meters (74 ft) wide.[1] The thick outer walls have delicately carved side entrances with few openings. The eastern and western side of the outer walls are reinforced by thirteen huge rectangular buttresses each typical of Earthquake Baroque architecture. The first buttress from the front is adorned by a huge relief retelling how the statue of Our Lady of Assumption was found on top of a tree.