The crumbling, sun-baked seafront city of Cádiz is said to be the oldest continuously inhabited settlement in the western world, founded by the Phoenicians around 1100 BC. Although the city lacks any obvious landmarks, it’s rich in atmosphere, and plays host to one of Spain’s most colourful carnivals.

From the warren-like medieval streets of the Barri Gòtic to the fantastical modernist architecture of Antoni Gaudí, from the dizzy heights of Mount Tibidabo to the golden sands of Barceloneta, there’s never a dull moment in Barcelona.

La Spezia is a busy port and Italy’s most important naval base, on the Ligurian coast to the south east of Genoa. The town itself has a certain authentic charm and an atmospheric old town, though you’ll most likely just be passing through en route to the beautiful villages of the nearby Cinque Terre.

One of the world’s great cities, Rome continues to dazzle and delight visitors with a potent mix of architectural marvels, continent-defining history and buzzing nightlife. The Colosseum, the Vatican and the Forum are among the big ticket items, with the crowds to match, though in truth you will find history around almost every corner.

Cartagena was founded by the Carthaginians around 227 BC, who named it after their home city in North Africa. These days the city is best known for its well-preserved Roman theatre, which was remarkably only discovered in 1987, in spite of its location in the centre of town.

Sovereignty of ‘The Rock’ has been a thorny issue ever since Gibraltar was ceded to Britain in 1713, though on the ground it’s clear where most locals’ sympathies lie. Gibraltar is often described as ‘more British than Britain’, a curious enclave of red postboxes, double decker buses and chip shops.

Southampton is the UK’s leading port. Bustling modern cruise terminals, as well as wharfs and commercial harbours, line the waterfront, whilst the city itself is a fascinating mix of ancient and modern, with a picturesque old town, the original city walls still standing, and super-modern shopping centres and office complexes