The ruined castle above Esch-sur-Sûre is the most dramatic sight in the Éislek region, rising from a rocky spur almost entirely surrounded by a bend in the Sûre river. The town below — really just a handful of houses and a church — sits in the loop, and the effect from above is of a natural moat. The climb to the castle is short and steep; the views from the top over the forested valley are worth every step.
Esch-sur-Sûre itself is a pleasant place to stop for lunch. The village has a couple of good restaurants serving local cuisine, and the path beside the river makes for an easy walk before or after the castle.