Split centers on Diocletian's Palace, a Roman emperor's retirement fortress that somehow became a living neighborhood, its walls now packed with cafes, shops and homes. Step inside to Peristyle Square, ringed by ancient columns and sphinxes, then climb the bell tower of the Cathedral of Saint Domnius for rooftop views over the old town. Just outside the palace walls, the Riva Waterfront Promenade offers a palm-lined stretch for coffee and people-watching against the Adriatic. These sights sit within a few minutes' walk of each other, making them the most efficient way to grasp Split's layered history without losing a full day to transit.