Šibenik's main monument, its Gothic-Renaissance cathedral, built of pale-gray Dalmatian stone and designated a UNESCO World Heritage Site, stands on a raised piazza close to the seafront promenade. From here a network of narrow, cobbled streets leads through the medieval quarter of tightly packed, terra-cotta–roof houses, and up to the ruins of a 16th-century hilltop fortress. The city has never been a real tourist destination. Before the Croatian war for independence, it was a relatively prosperous industrial center, but when the factories closed, Šibenik sank into an economic depression. However, the cathedral more than warrants a look, and it makes a decent base for visiting the waterfalls of Krka National Park.