a traffic hub to the nearby beaches of Villasimius, Chia, Pula and Costa Rei, as well as to the urban beach of Poettu. Pula is home to the archaeological site of the Punic and Roman city of Nora. Especially in summer many clubs and pubs are goals for young locals and tourists. Pubs and night-clubs are concentrated in the Corso Vittorio Emanuele II, a narrow street in Stampace district, in the Marina district, near the port and in the Castello district, The clubs are mostly to be found on the Poetto Beach (in summer) or in Viale Marconi (in winter). In Cagliari there are 180 B&B and 22 hotels that totals 3,300 beds. There are many others hotels in seaside resort of his gulf. Main sights Considerable remains of the ancient city of Karalis are still visible, including those of the Tuvixeddu necropolis (the largest Punic necropolis still in existence), the Roman amphitheatre, traditionally called Is centu scalas ("One hundred steps"), and of an aqueduct used to provide generally scarce water. Still visible are also some ancient cisterns of vast extent, the ruins of a small circular temple, and numerous sepulchres on a hill outside the modern town that appear to have formed the necropolis of the ancient city. The Palaeo-Christian Basilica of San Saturnino, dedicated to a martyr killed under Diocletian's reign, Saturninus of Cagliari, patron saint of the city, was built in the 5th century. Of the original building the dome and the central part remain, to which two arms (one with a nave and two aisles) were added later. A Palaeo-Christian crypt is also under the church of San Lucifero (1660), dedicated to Saint Lucifer, a bishop of the city. The church has a Baroque façade with ancient columns and sculpted parts, some of which came from the nearby necropolis. The old medieval town (called Castello in Italian, Casteddu de susu in Sardinian, "the upper castle") lies on top of a hill with a view of the Gulf of Cagliari (also known as Angels' Gulf). Most of its city walls are intact and include two early 14th-century white limestone towers, the Torre di San Pancrazio and the Torre dell'Elefante, typical examples of Pisan military architecture. The local white limestone was also used to build the walls of the city and many other buildings, besides the towers. The exact period of construction of a fortress on this hill