Ruins of the medieval town-fortress Hotalich are located 4km north-west from the today`s town of Sevlievo. The fortress was built by the Byzantines in the 5th century. In 10th century, at the same location, the Bulgarian state began construction of defense facilities to defend the country from the barbarian invasions from the north and Byzantium from the south.
The fortress was the largest in area except these of the old Bulgarian capitals Pliska, Preslav and Veliko Tarnovo.The excavations of medieval town of Hotalich and the fortress began for the first time in 1981. The archaeologists were found a high tower, two parallel walls (first of them dates back to the Early Byzantine period and the second from the 9th-10th century), remains of two main gates, ruins of quarters, churches, palace of the boyar (the local ruler), etc.
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.