Osor is a historic town located on the southwestern part of the island of Cres. The settlement has always been very important for sailors and islanders. It is in this part of the island that the islands of Losinj and Cres were once united, but today they are separated again.
Osor has more than 4,000 years of history. The city is surrounded by walls that date back to different periods. The place is called an open-air museum, because the colorful history of the town can be felt at every step. Osor was already inhabited in the prehistoric period, as evidenced by the traces of settlements. Osor experienced its economic boom only in the period of antiquity, when it was an important transit town. The main transit traffic between the Dalmatian coast and the Northern Adriatic took place here, which was made possible by the dug canal (Cavata, Cavanella, Kavuada). Osor was a well-known international port in that period. The historic center of the town is represented by the ancient town square. It is home to beautiful buildings from the 15th and 16th centuries, such as the cathedral with its bell tower, the town hall with its covered loggia, the former water reservoir and the bishop's palace. An interesting Museum of Sacred Art has its premises in the bishop's palace.
The sacral collection was established in the palace in 1997 with items from the treasury of the former city cathedral, today the parish church of the Assumption of Mary. Near the episcopal palace is the Gothic chapel of St. Gaudentius (Bishop of Osor) from the 14th century.