Fort de Pierre-Levée, also known as La Citadelle is a fortress built between 1858-1866. It was purposed for 400 soldiers. Since 1871 the fortress functioned as a barracks and prison. The most famous prisoner was Philippe Pétain (1856-1951), a French general who reached the distinction of Marshal of France, and was later Chief of State of Vichy France during World War II. He died in Fort de Pierre-Levée in 1951. The fortress was defined as a national monument in 1984.
References: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.