Near the German border, in Westerwolde (Southeast Groningen), is the fortress Bourtange.
In 1580 William of Orange gave the order to build a fort on the sand ridge in the Bourtanger moor, on the border of modern Germany. On the order of William Louis of Nassau the fortress was raised in 1593.
Between 1593 and 1851 Bourtange was an important fortress. An agrarian village came into being when the fortress was dismantled in 1851. Only a few buildings still remembered the glory of yesteryear. In the nineteen sixties the county of Vlagtwedde took the initiative to reconstruct the fortress. The plan was implemented between 1967 and 1992. Ramparts were again raised, ditches were dug and soldiers’ barracks were built.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.