Luxembourg Éislek Castle Loop — Vianden, Esch-sur-Sûre, Bourscheid

From Vianden the loop drops to the Our valley road and runs south before climbing west through the forests of the Canton of Wiltz to Esch-sur-Sûre, the pocket-sized village looped by the Sûre river beneath its ruined castle spur. The reservoir country of the Upper Sûre follows: lake views, forestry switchbacks and long empty sweeps north to Bourscheid, where the vast medieval castle stands on a promontory 150 metres above the Sûre. From Bourscheid the route drops into the Alzette valley at Ettelbruck — the Éislek's market town and the sensible fuel and coffee stop — before the return leg climbs back east over the ridge roads to Vianden. Expect narrow tree-lined sections, farm traffic and deer at dawn and dusk; the surface quality is uniformly good.