Piazza Unita d'Italia
Piazza Unita d'Italia is the largest seafront square in Europe, an open rectangle facing the Adriatic with grand Austro-Hungarian facades on three sides and the sea on the fourth. Free.
Castle in Trieste
The Castello di Miramare is a 19th-century castle on a cliff above the Adriatic, built for Archduke Maximilian of Habsburg. The park and grounds are free. The castle interior is paid. The gardens, with views over the Gulf of Trieste and the Karst plateau, are worth the trip alone. Budget travelers take the cheap bus from the center, walk the free gardens, and decide whether the interior justifies the ticket.
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Other places worth the walk, and what each one costs.
Piazza Unita d'Italia is the largest seafront square in Europe, an open rectangle facing the Adriatic with grand Austro-Hungarian facades on three sides and the sea on the fourth. Free.
Trieste's old town climbs the hill behind Piazza Unita to the Castello di San Giusto (free grounds, modest museum fee) and the Roman Theater (free to see from the street). The literary cafes (Caffe San Marco, Caffe degli Specchi) where James Joyce wrote parts of Ulysses and Italo Svevo drank coffee are part of the city's identity.
Working out what Trieste costs?
The whole of Trieste