Head east from Sorrento and you’ll come to the busy coastal city of Salerno. The Villa Communale – an oasis of greenery in the middle of the city – is well worth a visit. But the must-see here is the 1,000-year-old cathedral and its mix of building styles – from Arabic-Norman to Byzantine. The crypt of St Matthew has to seen to be believed. It's a gleaming room of marble, frescoes and a bronze statue of the Saint.