Alghero is a city on the northwest coast of Sardinia, Italy. Surrounded by ancient walls, it is known for its cobbled historic centre. Its Catalan Gothic-style buildings include the Cathedral of Santa Maria, with an impressive bell tower, the Guillot Palace and the 14th-century Church of San Francesco. The nearby Church of San Michele boasts a colorful dome decorated with tiles. The Coral Museum of Alghero exhibits red corals.