"A UNESCO World Heritage site, this 1,700-year-old palace sits on the Adriatic seafront, serving as the focal point of Split. It was built by the Roman emperor Diocletian as a seaside retirement home and has served as a refuge for many a conqueror over the centuries. Today, some 2,000 locals reside within the compound’s thick walls, making it a lively urban quarter. Getting lost in the labyrinth of surrounding streets is the best way to explore downtown Split—as you meander around, you’ll stumble across lively cafés and shops tucked into millennia-old buildings. Be sure to check out the Peristil, an imperial square framed by two colonnades, where Diocletian used to address the public. Towering above the square is Split’s major landmark—a 187-foot-tall belfry that you can climb for panoramic views of town."