The Notre Dame Gate is the main gate of the Cottonera Lines. In the 17th Century, the knights feared an Ottoman attack thus in 1670 they decided to build the Cottonera Lines to be able to defend the island. Five years later in 1675 the Notre Dame Gate was completed. The gate is built in the Baroque style and has five levels which comprises underground chambers, two barrack blocks and a superstructure consisting of a gatehouse built on two levels, a veranda and a signaling top. The Notre Dame Gate is listed on the National Inventory of the Cultural Property of the Maltese Islands and today it serves as the Headquarters of Fondazzjoni Wirt Artna.