Château du Bois-du-Loup, Heritage castle in Augan, France

Château du Bois-du-Loup is a ruined Neo-Gothic dwelling in Augan, built between 1871 and 1874 in coated schist rubble. Its main facade, entirely of dressed stone, faces south-east; the north facade mixes granite window surrounds with purple schist walls. The footprint covers 650 m², and about 2,000 m² of living space existed before its destruction.

An earlier structure was built in 1686 by Jean-François Larcher, but the current building was constructed between 1871 and 1874 by Count Roland des Clos de la Fonchais as a replacement. This later version represented a complete redesign of the site under new ownership.

The name Bois-du-Loup was recorded in 1679 as "Seigneurie du Bois du Loup". The seigneurie held high, middle and low justice rights since at least the 12th century, and its owner ranked as a leading noble. The 5 parallel barrack buildings beside the ruins were built in 1939 by Spanish Republicans using schist from the 37 demolished village houses.

The castle is not open to the public as it stands within a restricted military area of the academy. Visiting the site requires special permission from the appropriate authorities.

The castle was destroyed by the US Army during its stay at Coëtquidan between January and June 1945, when it was used as a target in artillery and bombing exercises. It was never restored and is now close to collapsing. The barracks beside the ruins were built in 1939 by Spanish Republicans from schist taken from the 37 houses of the surrounding village.