Rovinj, together with Poreč and Umag, is the tourist heart of Istria. Situated on a hill, the city is dominated by the bell tower of the Church of St. Euphemia, built in 1736 in the Baroque style. The historic centre, gathered within the walls erected by Venice to protect against pirates (12th century), is characterised by steep paved streets. All connections to the islands of Rovinj's archipelago start from Rovinj, and one-day panoramic cruises are also organized of the islands themselves, the coast and the nearby Lim canal. Not to be missed is the city’s Aquarium, and among the events organized, the Rovinj Fair held in August.