Lucca, Tuscany
The Renaissance Walls, the most significant monument of the city, form an intact circle of about 4 km in length, with a series of ramparts, an imposing complex of defensive works, ditches, gun outposts, barriersand large underground chambers, they lost their military value and were transformed into a beautiful public walkway. Duomo of San Martino: opening onto the piazza of the same name, the Duomo is surrounded by beautiful buildings from various periods. The facade, designed by the Lombard master Guidetto da Como in 1204, is one of the most significant examples.