Mythical Pula is a city of exiles from Colchis, who had come here in an unsuccessful attempt to recover the fabled Golden Fleece. This link to the story of the Argonauts, cherished in Pula, is far from being the only witness of the city's long history. The remains of early humans discovered in Šandalja cave are the oldest ever found in Europe. The fifth-century BC fort built by the Histrii is now reduced to ruins atop Kaštel hill, however with the advent of the Roman Empire, a new golden age of Pula began. Venetians and Austrians succeeded the Romans as Pula's overlords, and each of these have left a unique imprint on the architecture of Istria's biggest city.