Piazza Unità d'Italia

Piazza Unità d'Italia is the main square in Trieste, a seaport city in northeast Italy. Located at the foot of the hill with the castle of San Giusto, the square faces the Adriatic Sea. It is often said to be Europe's largest square located next to the sea. The square was built during the period when Trieste was the most important seaport of the Austrian-Hungarian Empire and includes the city's municipal buildings and other important palaces.

Before 1919 it was known as Piazza Grande, or Great Square. The local Slovenes still refer to it as Veliki trg, both in daily speech and in the media. In the last decade, the term Trg zedinjenja or Trg zedinjenja Italije has also become popular, especially in official documents.The square itself has occasionally been used as a concert venue, with Green Day using the square as a venue for a show on their 99 Revolutions Tour in 2013. The attendance was of 12,000 people.