De Viron Castle is a striking neo-Gothic mansion built in 1862 in Dilbeek, Belgium, commissioned by the de Viron family. Designed by architect Jean-Pierre Cluysenaar, this architectural masterpiece features 12 towers, 52 rooms, and 365 windows, with proportions reflecting the Julian calendar. Constructed on the ruins of a 14th-century fortification, the castle is surrounded by an expansive park with several heritage structures including a farm, ice cellar, and coach house. Since 1923, it has served as the town hall and municipal offices of Dilbeek and was protected as a monument in 1990.