Château de Bouillon from Pont de Liège

At just 0.4km, Château de Bouillon from Pont de Liège is short but deceptively intense — 25m of elevation packed into a brief, breathless effort. Averaging 6%, the road kicks to 9.4% at its steepest — a notable steepening that demands respect. It's over before the legs know what happened — a short, explosive effort where momentum is everything. Located in Wallonia, Belgium.