Łomża Cathedral was built between 1504-1525 and inaugurated in 1531. According a legend there was a church near the current cathedral already in c. 1000 AD. After the cathedral was damaged in Swedish wars it was restored to Gothic Baroque style in 1691-1692. The southern sacristy was added in 1886. Łomża Cathedral was again damaged in Second World War and rebuilt between 1952-1958.
The most precious treasure in the cathedral is a painting of the Virgin Mary dating from the 16th century and crowned by Pope John Paul II in 1991. There are also beautiful Renaissance items like two tombs of local governors from 1575 and 1611.
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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.