Three Castles of Ribeauvillé (Saint-Ulrich, Girsberg, Haut-Ribeaupierre)
Three ruined castles on the ridge above Ribeauvillé. Not rideable — lock the bikes in town and hike up (~40 min up to Saint-Ulrich); the view over the vineyards is the day's best.
From the route
Leaves the route in Ribeauvillé on day 3; 6.5 km one-way with 350 m of climbing on paved road.