sentences:  The north tower is called "Turris Davidica", or "Tower of David"—a devotional title of Mary symbolizing Mary as the refuge and protector against the power of darkness.The south tower, also 60 metres tall, is called "The Ivory Tower", which the whiteness and pureness of ivory describe the pureness of the Virgin Mary.On the Ivory Tower, there are old clocks that are still functioning as well as a church bell.