The King Friedrich Wilhelm I Fort (Fort Nr. 3), originally known as Quednau, was the largest fort of Königsberg fortification system. The fort was situated at the top of a height and surrounded by dry ditch. There were embrasures for defensive fire. In time of Kongsberg Storm the Fort was of severe resistance. Garrison remains was captured on the 9th of April 1945. After the WWII there was the army division in the Fort. Archeologists have found more than 30 000 objects from the ex- museum “Prussia”, when the division left.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.