The Church of the Holy Archangels Michael and Gabriel in Nesebar, Bulgaria, is a partially preserved medieval Eastern Orthodox church, built in the 13th or 14th century. As part of the Ancient Nesebar UNESCO World Heritage Site, it stands in the old town and has been under state protection since 1927. The church, with a cross-in-square plan, features three apses and a large narthex. Despite partial preservation, it remains culturally significant, boasting opulent external decoration characteristic of Nesebar's medieval religious architecture. The architectural style, opus mixtum, incorporates alternating rows of brickwork and stones in a chequered pattern.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.