Split & Trogir in 2-3 Days — Diocletian Palace & Island Ferry

Practical Tips

Cathedral of St Domnius (Katedrala svete Dujma): Diocletian's original octagonal mausoleum, converted to a Christian church. The original Roman sarcophagus is under the altar. Bell tower climb (183 steps) gives the best view over the palace and the Adriatic. Combo ticket (cathedral + bell tower + treasury + crypt): €10. Book at the south entrance.
Substructure (Podrumi): the preserved Roman cellars under the Peristyle — the best surviving example of Roman vaulted architecture in the world outside Rome. €7, open daily. The Game of Thrones throne room scene (Daenerys + dragons in Meereen) was filmed here. You'll recognise it immediately.
Peristyle: the Roman garden/reception square. Sunday evening classical music concerts (21:00 in summer) — free, performed by local musicians on the original Roman steps. Attend if your weekend includes a Sunday.
The Vestibule: the circular domed anteroom between Peristyle and the Diocletian apartments — the dome is open to the sky (partially collapsed). Acoustically extraordinary. Local choirs perform here informally — stop when you hear singing.
Street food inside the Palace: several small shops in the medieval lanes sell ćevapčići, pljeskavica (grilled minced meat patty), and burek (filled pastry). Correct price: €3–5. Any restaurant on the Peristyle square itself: tourist pricing (€20–30 mains).