The hook
A Roman emperor's retirement palace that never became a ruin, because people simply moved in and never left — so its fourth-century walls, cellars and colonnaded courtyard now contain apartments, bars and laundry lines, seventeen centuries on.
01Why it's worth it
Diocletian built his palace here around 305 CE, and when the empire receded, refugees from a sacked nearby city took shelter inside the walls and built a town in it. That continuous habitation is what makes Split different from every other Roman site: you don't walk a fenced monument, you walk a living quarter where medieval houses are wedged between imperial columns, the emperor's mausoleum became the cathedral, and the vaulted substructures, once used to level the seaward side, now hold market stalls. The Peristyle courtyard still functions as a public square. Beyond the walls, the Riva promenade runs along the water, Marjan hill gives pine woods and swimming coves within walking distance of the centre, and the ferry port makes Split the gateway to Hvar, Brač, Vis and the rest of Dalmatia.
The honest note: it is very busy in high summer, when cruise passengers and island-hoppers converge, and prices have climbed steeply. Shoulder season transforms it.
02How to experience it
Walk the palace early, before the tour groups fill the Peristyle, and go down into the cellars. Climb the cathedral bell tower for the roofscape, then take the path up Marjan and swim at a cove below it. Use Split as your ferry base for the islands, and come in late spring or September.
From the locals
Travellers describe it as the pleasant surprise of a Croatian trip: "I liked Split, it wasn't that crowded when we were there, the old city is" the draw, one wrote of a spontaneous circuit taking in Plitvice, Zagreb and Dubrovnik. The recurring pairing is with the lakes and the islands rather than with Dubrovnik alone.