Pula or Pola is the largest city in Istria County, and the eighth largest city in the country, situated at the southern tip of the Istria peninsula. It is known for its multitude of ancient Roman buildings, the most famous of which is the Pula Arena, one of the best preserved Roman amphitheaters, and its beautiful sea. The city has a long tradition of wine making, fishing, shipbuilding, and tourism. It has also been Istria's administrative centre since ancient Roman times. The natural beauty of Pula/Pola's surrounding countryside and turquoise water of the Adriatic have made the city an internationally popular summer vacation destination. The pearl nearby is Brioni island or Brijuni national park visited by numerous world leaders since it was the summer residence of Josip Broz Tito. Roman villas and temples still lie buried among farm fields and along the shoreline of the dozens of surrounding fishing and farming villages. The coastal waters offer beaches, fishing, wreck dives to ancient Roman galleys and World War I warships, cliff diving, and sailing to unspoiled coves and islands large and small.