In a deep, thickly wooded valley, the River Bosna turns abruptly almost 180 degrees creating a sharp ridge on which this little 15th-century Vranduk castle sits in the midst of a tiny, charmingly coherent village. Vranduk represents one of many medieval Bosnian towns with intensive political, economic and cultural life. The castle is composed of a citadel with the main tower and a protective wall, surrounding the interior of the medieval town.
After taking the city in the 15th century, the Turks built a mosque alongside to the citadel. During Eugene of Savoy’s devastating campaign in 1697, he bypassed the fortress completely as it posed too great an undertaking, leaving it the only fortification left unconquered. Today, Vranduk offers visitors an authentic taste of Bosnian history, in both the museum set up in the great tower, and the traditional Bosnian meals.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.