Monte Castello oppidum, like other Etruscan habitats of the island, controlled the ancient ironworks, was strategically located above a hilltop between Ligurian Sea to the north and the Tyrrhenian Sea to the south. It had a rectangular plan (30 x 60 m), consisting of overlapping blocks of local stone. The settlement, which was excavated in 1977, was inhabited since the first half of the 4th century BC. It was settled until about 250 BC, until the Roman conquest of the island of Elba. Among the recovered archaeological materials, now preserved at the Archaeological Museum of Marciana, there is a valuable terracotta head with a tapestry of Atelier des petites estampilles, the Ferrara T 585 skyphoi, Genucilia type plates, grain-bearing ores, Etruscan amphorae And Greek-Italic, truncopyramidic weights, fusaiole and webbing spools. Noteworthy is the presence of pavement in opus signinum.
References:Amazing place
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.