Molo Longo Breakwater

Rijeka's 1,707-metre breakwater is the longest promenade of its kind on the Adriatic and one of the city's underrated pleasures. Built between 1872 and 1888 in Istrian stone to shelter what was then the fifth-busiest port in Austria-Hungary, the Molo Longo still functions as a working sea defence — car ferries to Cres glide past on your left — but locals have adopted it as their favourite walking, running and rollerblading route. The east–west axis means you get a full-frontal view of Rijeka's amphitheatrical old town rising against the Učka massif on the way out, and on the way back the horizon opens onto Krk and, on clear winter days, the peaks of Velebit sixty kilometres away. Anglers fish from the outer edge; young couples end long summer evenings sitting on the concrete lip with their feet dangling above the sea. Rijeka's harbour master closes the outer half whenever a cruise ship berths, so check the schedule if you want to walk the full length. Sunrise and blue hour are the best photographic moments — the low sun lights the pastel façades of Riva Boduli in warm honey tones. Free at all times, entirely flat, and one of the very few places in the city where you'll hear nothing but the sea and the gulls.