is unknown at present, due to the superposition of layers of buildings along the history. Some scholars have suggested a first urbanization of the quarter in the Punic era on the basis of similarity of the planimetry with the contemporary Carthaginian fortress of Monte Sirai. Recently, archaeological excavations have identified Punic and Roman buildings under the ramparts of the fortress. Already the Roman poet Varro called the city "Vicus munitus", a fortified city, and sixteenth-century authors describe a Roman acropolis perhaps still visible in their day. D. H. Lawrence, in his memoir of a voyage to Sardinia, Sea and Sardinia, that he undertook in January 1921, described the effect of warm Mediterranean sunlight on the white limestone city and compared Cagliari to a "white Jerusalem". The cathedral was restored in the 1930s, returning the former Baroque façade into a Medieval Pisan-style façade more akin to the original appearance of the church in the 13th century. The bell tower is original. The interior has a nave and two aisles, with a pulpit (1159–1162) sculpted for the Cathedral of Pisa but later donated to Cagliari. The crypt houses the remains of martyrs found in the Basilica of San Saturno (see below). Near the cathedral is the palace of the provincial government. Before 1900 it was the island's governor's palace. The Sanctuary of Our Lady of Bonaria (from which the city of Buenos Aires, Argentina, gets its name) was built by the Catalans in 1324–1329 when they were besieging the Pisans in Castello. It has a small Gothic portal in the façade and the interior houses a wooden statue of the Madonna, which, after having been thrown off a Spanish ship, landed at the foot of Bonaria hill. Bonaria hill is also the location of the Monumental Cemetery of Bonaria. The Chiesa della Purissima is a Catalan Gothic church built in the 16th century in the Castello distinct. The other early districts of the town (Marina, Stampace and Villanova) retain much of their original character. In Stampace the Torre dello Sperone, another tower built by the Pisans in the late 13th century, is located, as well as two important monumental churches: the Collegiata di Sant'Anna and the Chiesa di San Michele, both built in the 18th century in a baroque style. Many more churches, both old and modern, can be found throughout the city. The Promenade Deck and the Terrazza Umberto I were