Split is the largest Croatian city on the Adriatic coast. Split achieved fame when the Roman emperor Diocletian, noted for his persecution of early Christians, had his retirement palace built here. The spectacular stone edifice and its grounds and cellars are a major highlight of any city tour. Other points of interest include the Cathedral of St. Duje, built on the remains of an ancient shrine purported to be the oldest in the world; and the Mestrovic Gallery, where the impressive works of Croatian sculptor Ivan Mestrovic are available for viewing in this home and atelier.