Tvrđa Fortress

Tvrđa is the old fortress district of Osijek, the largest city of Slavonia in eastern Croatia, and it is the biggest and best-preserved ensemble of Baroque military architecture in the country. The Habsburg authorities began to build it after they drove the Ottomans out of the region at the end of the 17th century. Osijek had been an Ottoman town, known as Esseg, and sat at a strategic crossing of the Drava river, with marshes on one side and the plain on the other, so the new rulers wanted a strong fortress to secure the frontier. Building went on during the early decades of the 18th century, and the design is credited to military engineers working in the Baroque tradition, including Maximilian Gosseau de Henef, with a star-shaped plan, thick earthen and brick ramparts, bastions and ditches.

Inside the walls, a grid of regular streets runs between large, uniform buildings painted in warm yellow, which housed barracks, offices, storerooms, the commander's residence and the homes of officers and officials. The centre of this district is Holy Trinity Square, a broad, elegant space framed by long façades, with a large plague column in the middle, put up in the 1730s to give thanks for the end of an epidemic. Around it stand the former Town Hall and guardhouse, the Magistrate building, which now houses the Museum of Slavonia, and the Church of the Glorious Name of Mary, with its tall tower. The district also contains the Rectorate of the University of Osijek, galleries, small shops and cafés, so it is a living neighbourhood rather than a museum.

Visitors can walk through the cobbled streets, climb to the ramparts and pass through the Water Gate, which once led from the fortress to the river. The walls and bastions give views over the Drava and the surrounding park, and the old defensive ditches are now green spaces. Tvrđa has suffered damage over the years, including during the war of the 1990s, and many buildings still show scars, but restoration work, supported in part by the European Union, has been returning them to use. The area is open at all times, there is no admission fee for walking around, and it is a good place for spontaneous exploring, although museums and galleries have their own hours.

There is much to combine with a visit. The Archaeological Museum, the Osijek Catacombs, the pedestrian bridge over the Drava, the riverside promenade and the zoo are all close, and the Portanova centre and Mačkamama are in town. In summer, festivals, concerts and student events fill the squares, and the cafés spill out onto the cobbles.

Tvrđa suits history lovers, architecture enthusiasts, photographers and families. Allow two to three hours, and visit in the early evening, when the yellow walls glow in the low light.