Split's centre is a Roman palace people still live in, so most of the sightseeing is free and at street level; the paid highlights sit just outside the walls.
The palace substructures (Podrumi)
The vaulted Roman cellars beneath Diocletian's apartments, whose plan mirrors the rooms that once stood above and which helped put Split on the UNESCO list in 1979. The eastern halls opened to the public in 1995; the central passage from the Riva up to the Peristyle is a free souvenir market, while the side chambers are ticketed and used for exhibitions.
Klis Fortress
The fortress guarding the pass 12 km inland from Split, open daily 08:30–20:30; €12 adults and €4 for under-15s, with the ticket also covering the interpretation centre on Mejdan Square below, the Stella Croatica agro park and the olive museum. Go for the view straight down the valley to the coast.
Meštrović Gallery
Ivan Meštrović's own villa at Šetalište Ivana Meštrovića 46 on the south flank of Marjan, holding his sculpture. Tuesday to Sunday 08:00–18:00, closed Mondays and public holidays, last entry 30 minutes before closing; the related Crikvine-Kaštilac chapel is a few hundred metres along at number 39.
Marjan Forest Park
The wooded hill closing the western end of the peninsula, run as a protected park by a city institution based at Fra Bonina 11. Free to walk, with stepped paths up from the Varoš quarter to the viewpoints and down to the beaches at Kašjuni, Ježinac and Prva Voda. The obvious escape from the palace crowds.
Salona and the Archaeological Museum
Salona at Solin, the Roman provincial capital Diocletian retired from, is managed by the Archaeological Museum in Split at Zrinsko-Frankopanska 25, which opens Monday to Saturday 09:00–14:00 and 15:00–20:00 from June to September and closes Sundays and holidays. Note that the permanent display is given over to the Delmatae exhibition until 31 October 2026.