Diocletian's Palace represents a significant architectural complex and its greatest value derives from its continued existence, spatial adaptations and functional conversions. Robert Adam and his book, Ruins of the Palace of the Emperor Diocletian at Spalatro in Dalmatia, was a first scientific attempt to document, interpret and understand the Palace and nowadays still represents capital documentation for the study of the Diocletian's Palace. His publication holds very a important place in the history of art and architecture of the 18th century, but also plays a significant role in constructing an iconic image of the Palace and the city. Robert Adam was the first one who established the status of the Palace and its specific points and enabled the idea of continuity in the Palace through his visual and verbal representations, which should be revisited when thinking about today-s city. We cannot think about the Palace, without thinking about the city, and vice versa, and Adam suggested this already in 18th century.