The new Heidengraben tower with 102 steps is located at the Hochholz car park, the highest point of the Heidengraben site. From the 18-meter-high viewing platform you can overlook the Heidengraben site, where the Celts once lived. According to architect Thomas Ott, the triangular shape of the observation tower is dedicated to the three communities involved in the Heidengraben project: Hülben, Grabenstetten and Erkenbrechtsweiler