On the edge of Cagliari’s Castello district, Palazzo Boyl is set a neoclassical residence built in 1840 on the city’s former Pisan walls. Today the restored Liberty cream-coloured palace is an intimate boutique hotel, its sea-facing windows opening onto views of the harbour and the historic centre below. Along the marble balustrade, statues of the four seasons quietly preside, while tucked within the palace stands the Torre del Leone – a 14th-century Pisan tower still bearing cannonballs from the sieges that once rattled the city.