“ It lies in the south-east angle of the Bay of Naples, at the beginning of the peninsula of Sorrento, and owing to the sea and mineral water baths (12 different springs) and its attractive situation, with a splendid view of Vesuvius and fine woods on the hills behind, it is a favourite resort of foreigners in spring and autumn and of Neapolitans in summer. The castle from which it takes its name, on the hill to the south of the town, was built by the emperor Frederick II. There are three large churches of the late 18th century. There are a large royal dockyard and a small-arms factory ”