Arriving by ferry at La Spezia reveals the many different sides of this city, seen as strips of varying colours. The moored boats symbolise the eternal link between the people of Spezia and the sea. Palm trees are apparently a remnant of the period following the Unification of Italy when, with the establishment in La Spezia of the Military Marine Arsenal, it was deemed necessary to plant trees and gardens to accompany economic growth and provide nicer settings. In the heights of La Spezia can be seen the palaces of the historical centre, and in between them run the 'caruggi' and arched pedestrian alleys. Higher still stands San Giorgio Castle. This fortress, which was built between the 14th and 17th centuries, can be reached by climbing the stairs that leave from Via Prione street. On arriving at the castle, the perspective is reversed: now you can see the city, the palaces, the green spaces of the 19th century gardens, the port, the boats, and beyond that, the infinite expanse of the sea.