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:Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.