Diocletian's Palace: the Roman emperor's retirement home that became a city On the Adriatic coast of Croatia, the old heart of Split is not built beside a Roman ruin — it is built inside one. The Palace of Diocletian is one of the best-preserved monuments of Roman architecture anywhere, a vast fortified residence raised for a retiring emperor that, seventeen centuries later, still shelters homes, shops, cafés and churches within its ancient walls. To wander…...