Château or Donjon de Bours was most likely built in the 12th century by Hugues de Bours. Originally it would have had a bailey defended by a crenellated wall guarding several outbuildings. Both the bailey and the castle would have been moated. At present all traces of the bailey are gone.
Bours Castle is a keep built out of sandstone and has a rectangular plan with six corbelled turrets. It has walls of 70 cm thick and 2 floors. It is generally assumed that during the mid-13th century the keep would have been higher.
During the first half of the 15th century the castle was owned by Maillotins de Bours who restored and enlarged the castle but probably did not change the keep.
In 1543 Bours Castle was burned down.
At the beginning of the 20th century there was talk of demolishing the keep but luckily that did not happen. During the second half of the 20th century the keep was restored several times and used as a town hall.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.