Donjon de Bierbais, Medieval keep in Mont-Saint-Guibert, Belgium.
The Donjon de Bierbais is a medieval keep in Mont-Saint-Guibert featuring thick stone walls, narrow window openings, and multiple stories built with rubble and brick materials. The structure combines different materials and building methods added at various times.
The Lords of Bierbais built the tower in the 12th and 13th centuries as a control point for a larger fortified enclosure. In the early 1800s it received a crenelated platform and additional brick levels that fundamentally altered its appearance.
The tower displays construction methods from different periods, showing how people in this region built their defenses. Its appearance reveals layers of changes that were added over centuries.
The tower stands at Rue de Bierbais 6 and is private property but can be photographed from the adjacent public road. Visitors can view and examine the outer structure and architecture from outside.
Between 1820 and 1830 the tower underwent renovation and received a crenelated platform that completely changed its military appearance. This shift from a pure defensive structure to a residential building with decorative elements is visible in its mixed architecture.
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