The Princely Castle at Bogolyubovo (1158-1165) contains the remains of the 12th century Royal Palace, in the form of the Cathedral of the Nativity of the Virgin and the Staircase Tower of Andrei Bogolyubskii. Bogolyubovo was once the residence of the Prince Andrei Bogolyubsky. Great Prince Andrei spent 17 years of his reign in Bogolyubovo before he was murdered there in 1174. After Prince Andrei's death, Bogolyubovo was ravaged and ransacked by Prince Gleb of Ryazan in 1177. In 1230s, the Mongols destroyed its fortifications.
The cathedral is a 17th century building on the site of the original structure. There is a tent-roofed bell-tower of the 17th century. The Church of the Intercession (1165) on the Nerl River is located at the point of the original river gate of Vladimir. It has a single dome supported on four piers with a helmet dome at the crossing and reliefs on the upper part of the exterior walls.References:
The Château Comtal (Count’s Castle) is a medieval castle within the Cité of Carcassonne, the largest city in Europe with its city walls still intact. The Château Comtal has a strong claim to be called a 'Cathar Castle'. When the Catholic Crusader army arrived in 1209 they first attacked Raymond-Roger Trencavel's castrum at Bèziers and then moved on to his main stronghold at Carcassonne.
The castle with rectangular shape is separated from the city by a deep ditch and defended by two barbicans. There are six towers curtain walls.
The castle was restored in 1853 by the architect Eugène Viollet-le-Duc. It was added to the UNESCO list of World Heritage Sites in 1997.