Old Cathedral, Brescia

The Duomo Vecchio or Old Cathedral is a Roman Catholic church in Brescia, Italy; the rustic circular Romanesque co-cathedral stands next to the Duomo Nuovo of Brescia. It is officially known as the Winter Co-Cathedral of Santa Maria Assunta, while the adjacent main cathedral is known as the Summer Cathedral.

It is one of the most important examples of Romanesque round church in Italy.

While some claims for an earlier construction exist, the earliest documents state that construction of the cathedral started about 1100 on the site of a prior church with a basilica layout.

Source: Wikipedia