Leignon Castle, Castle in Leignon, Ciney, Belgium

Leignon Castle is a late 19th-century eclectic castle in Leignon, near Ciney, built around an older core by architect Auguste Van Assche. Its walls are of uniform limestone rubble, except for a square brick tower with limestone quoins and a crenellated top. The rear facade shows four towers: two round, a square one and an octagonal one, each with a different slate-roofed bell top. A dated 1901 mosaic decorates the porch under a canopy at the back.

Belgian diplomat Isidore Jacques Eggermont acquired the estate in 1890 and commissioned architect Auguste Van Assche to rebuild the castle. This reconstruction shaped the building's appearance and made it a work of the late 19th century.

The castle is also known as the Château des mille fenêtres, the castle of a thousand windows. Its interiors mix Napoleon III, neo-Gothic and Art Nouveau–Art Deco rooms, and the library is in solid mahogany. Painted medallions on the first-floor landing show Isidore Eggermont's travels, and one salon has wallpaper of historical scenes of Leignon facing an alabaster fireplace.

The castle is private and cannot be visited; only the exterior is visible from the public road. The 11-hectare park and the nearby stables and outbuildings are also off-limits, as they belong to a Dutch-speaking youth association and other owners. Access to the agricultural buildings and land is separate from the castle.

The castle is also known as the Château des mille fenêtres, the castle of a thousand windows. The painter Jacques Eggermont, son of Isidore, was born here on 27 October 1918. The outbuildings next to the castle, including the former stables, belong to a Dutch-speaking youth association, while the old farm belongs to a third party.