The Moorish fortress or Alcazar of Carmona rises above the Puerta de Sevilla (Gate of Seville), forming an almost impregnable defensive complex. It underwent major alterations in the 14th and 15th centuries. Theestoration work carried out between 1973 and 1975 included the refurbishing of several sections as venues for staging cultural events.
Puerta de Sevilla origin dates back to the 9th century BC. The Carthaginians created the first layout, of heavy rectangular appearance, and made it their bastion against the Romans. The Romans reinforced and restored the structure with a set of gates which is still preserved. Many interventions were carried out from the 12th century onwards.
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.