When leaving the charming historic small town behind, you might still be able to hear the sound of the “Heroes’ Organ” with its 4,948 perfectly tuned pipes – the world’s largest outdoor organ. First, take the train to Unterlangkampfen where the trail starts right above the church. Follow a steady climb through old-growth forest to gain elevation once again. Then take on a narrow path from Höhlensteinhaus Lodge to Köglhörndl, where you will enjoy magnificent views of Inntal Valley. The path continues to Hundsalmjoch Col at 1,637 metres altitude. Close to Alpengasthof Buchacker (unwardened mountain hut) you will find Hundalm Ice Cave, at an elevation of 1,520 metres. Descend to the underground world directly from the top of the mountain. Almost like Plato’s allegory of the cave!