In the III century the emperor Diocletian built a huge castle on the coast, the area of ​​which exceeds 4500 square meters. Here the emperor spent his last years of life. 300 years later, its high walls sought protection from the attacks of the Avars and Slavs residents salons (formerly of Split).

Most of the palace was destroyed over time, remained the main entrance, the Golden Gate, the Church of St. Martin, bronze and iron gates and Peristyle (colonnade surrounding the palace). When Diocletian Peristyle arranged in various festivals and ceremonies, and now during festivals are theatrical performances.

In the cellars of Sea Gate one can see the arches of the walls of stone blocks and brown bricks, based on square columns. These facilities are now chosen by the local souvenir sellers.

In the north-eastern part of the Diocletian's Palace is Papalichey Palace, built in the middle of the XV century. Juraj Dalmatinatsem. It Papalichi known humanists of his time, the first to collect the local antiquity. Thus arose the City Museum with a very interesting exposition.