Château-Gaillard, Medieval hilltop fortress in Les Andelys, France
Château-Gaillard is a medieval fortress crowning a hilltop above the Seine, constructed with rings of walls arranged one inside the other to create overlapping defense layers. Each enclosure served a specific defensive purpose, with the central keep standing as the final stronghold within the innermost ring.
An English king commissioned this fortress between 1196 and 1198 to defend Normandy against French expansion along the Seine valley. The castle fell to French siege and was later dismantled, though its ruins preserve the original architecture.
The fortress shows how medieval builders rethought defense by arranging walls in nested circles rather than simple lines. This design influenced how castles were built across Europe for centuries.
The ruins are open to visitors from March to November, with information panels explaining the building methods of the era. Wear sturdy shoes since the ground is uneven and pathways include steep steps.
The fortress pioneered the use of defensive projections with arrow slits that let defenders control the ground in front of the walls more effectively. This innovation became a standard feature in castles across medieval Europe.
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