Located on Battenberg Square in Sofia, the National Art Gallery occupies the historic Ottoman Chelebi mosque and konak, converted into the former royal palace of Bulgaria. The palace, built in two stages during the late 19th century, served as the residence for Bulgarian royalty. After World War II, the monarchy was abolished, and the palace was largely given to the National Art Gallery.
 Established in 1934, the gallery moved to the palace in 1946. It houses a diverse collection, including Renaissance and contemporary art, medieval paintings, and over four thousand icons. The National Gallery for Foreign Art, an independent section, was established in 1985. Since 2015, the 19th and 20th century collections are exhibited together, creating the National Gallery Square 500.
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.