The city, port and the largest settlement on the peninsula (62,378 inhabitants). It is situated in a well protected bay and surrounded by "the seven hills": Kaštel, Zero, Arena, St. Martin, St. Michael's Abbey, Mondibola and St. Ivan. It has good road and railroad connections with the rest of the country and there is the international airport near the city. During the Austro-Hungarian Empire it was a military port. Today, it is the administrative, educational and industrial center. The natural beauties of its surroundings also enabled quick tourist development: beside the facilities in the city there are many tourist objects, camps and marinas in the surrounding area. On the hill Kaštel, even in the 5th century BC, there was an Illyrian hillfort. The Roman settlement (Colonia Julia Pollentia Herculanea) was founded between 44 and 31 BC. The structure of the prehistoric settlement was kept in the later Roman, medieval, and even present urban structure of the old part of the town. The Roman amphitheater (Arena) from the 1st - 2nd century AD, lies on the dominant position above the port.