Alghero is a city on the northwest coast of Sardinia, Italy. Encircled by ancient walls, it’s known for its cobblestoned old center. Its Catalan Gothic buildings include the Cattedrale di Santa Maria, with an imposing bell tower, Palazzo Guillot and Chiesa di San Francesco, a 14th-century church. The nearby Chiesa San Michele has a colorful tiled dome. The Museo del Corallo di Alghero contains red coral displays.