Nat’Our Route 5 Vianden September 27, 2025December 7, 2025 Jonny Orr2 Comments 13km โ Challenging. A spectacular cross-border loop linking the castles of Vianden and Falkenstein. Expect sweeping views, punishing climbs, and the exhilarating Lรคtgesbierg ridge. Lace your boots up tight and watch your step!