Diocletian’s Palace dominates the city’s historic core. There’s nothing else like it in Europe: It’s a wonderfully-preserved 4th-century complex blending Diocletian’s stately retirement villa with the remnants of a large military camp. 

Such is the scale that it’s more of a citadel than a palace, and surprises await around every corner. Needless to say that the palace is UNESCO-listed, and you’ll even be able to tread the original Roman streets that cut through the complex: decumanus and cardo still have their original paving stones