Bari's historic centre is a city within a city, a maze of narrow alleys, courtyards, historical palaces, and bars. It houses approximately 30 churches and many wonderful buildings, such as the Basilica of San Nicola, the Cathedral of San Sabino, and the Norman-Swabian Castle built by Frederick II. Stretching along Italy’s longest seafront, Old Bari is the ancient heart of the city. Visitors are accompanied by the aroma of clean laundry and freshly-baked focaccia and by the sight of fresh pasta drying in doorways, as they walk through the old city.