The Château de Naillac is a restored medieval keep that now houses Le Blanc's local history museum. The tower stands on the high bank above the Creuse river and dominates the old quarter of town. The museum covers the Brenne region's archaeology, natural history, and local traditions — modest in scope but well-suited to an hour's orientation before heading out into the countryside.
More than the museum, the value here is the view from the tower's upper platforms: the Creuse valley stretching west, the old bridge below, and the patchwork of the Brenne's wetlands visible in the distance on clear days. The town is seen to good advantage from here as well — the church of Saint-Génitour with its Romanesque tower, the river bend, and the tile-roofed houses of the old quarter.
The castle is open in the warmer months; check locally for current hours. Entry is cheap. Combined with a walk through the old quarter and across the bridge, it makes a good introduction to Le Blanc before driving out to the Brenne.