The star-shaped Venetian fortress at the top of Pula's hill offers the best panoramic views in the city — the old centre below, the harbour, the Brijuni islands in the distance on clear days, and the amphitheatre seen from above. The fortress was built in 1630 to replace earlier medieval defences and has never seen serious military action; it served for much of its history as a storehouse and prison.
Today it houses the Historical and Maritime Museum of Istria, with exhibits covering Pula's long and layered history from Roman times through Austrian rule to the 20th century. The museum collection is competent rather than exceptional, but the walk up through the old town streets and the views from the ramparts justify the visit on their own. Entry is cheap.