I visited this WHS in April 2014. It's an excellent base to visit the 3 other WHS nearby. I spent 4 days here and I would have stayed longer had I had the possibility. The historical complex of Split is actually within the Diocletian Palace itself! So there are several houses and buildings that have a Roman Palace facade thousands of years old. This is immediately visible from the waterfront or else from the Peristil Square. In the Peristil, just after the Silver Gate, there are several Roman buildings from the 3rd/4th century AD to visit: the Mausoleum of Diocletian (now the Cathedral of St. Doimus) with its octagonal shape very similar to a baptistery, the vestibule, the underground passageway beneath Diocletian's Palace. It's also possible to climb the belfry to enjoy a panoramic view over Split, although a short rest beside the black sphinx statue from Egypt would be equally rewarding. The actual early Middle Ages baptistry can be found in the former Temple of Jupiter with a beautiful cross-shaped baptismal font. The Golden Gate should not be missed with its intricate carvings and statues but also to see the huge Gregorius of Nin statue and another tower. Another interesting square is the Narodni Trg with its Venetian aura, a beautiful clock tower and the famous balcony from which Mussolini delivered his speech. I enjoyed Split and would visit again in a heart beat. Not only does it have much to offer, but many islands and other WHS are just a ferry ride away!