Poreč is set around a harbor protected from the sea by the small island of Sveti Nikola (St. Nicholas). The town's population of approximately 12,000 resides mostly on the outskirts, while the wider Poreč area has a population of approximately 20,000 inhabitants. Its major landmark is the 6th century Euphrasian Basilica, a UNESCO World Heritage.
The town plan still shows the ancient Roman Castrum structure. The main streets are Decumanus and Cardo Maximus, still preserved in their original forms. Marafor is a Roman square with two temples attached. One of them, erected in the first century AD, is dedicated to the Roman god Neptune. A few houses from the Romanesque period have been preserved and beautiful Venetian Gothic palaces can be seen here. Originally a Gothic Franciscan church built in the 13th century, the 'Dieta Istriana' hall was remodeled in the Baroque style in the 18th century. The Euphrasian Basilica, rebuilt in the 6th century under the Byzantine Empire and bishop Euphrasius, is the most important historical site in Poreč. It is a protected World Heritage Site, so designated by UNESCO.