Climbing 'Alteisen' (Old Iron), a classic 4+ route on the Frankfurter Weg, is a delightful experience. This route, renowned for its solid rock and engaging moves, offers a perfect blend of challenge and enjoyment for climbers comfortable at this grade. Despite its moderate difficulty, there are sections that require focus and precise footwork. The exposure on certain parts of the route, combined with the breathtaking views of the surrounding landscape, adds to its charm. Reaching the top provides a great sense of accomplishment, marking the successful ascent of a true classic within the Frankfurter Weg area.