To visit Dubrovnik is to step back in time to the Middle Ages. The town is one massive museum, its thick walls constructed from the 13th to the 17th century encircle the entire city, and contain within them a treasure trove of striking architecture – squares, fountains, palaces, churches, and monasteries, all built from the same stone, line streets free of motor vehicles. Once the only city-state on the Adriatic to rival Venice, Dubrovnik has long been a center for Croatian culture, and home to artists and scholars of all disciplines. It is possible to circumnavigate the city atop the medieval walls.