Gate tower, height 40 metres, built in 1531, tower clock by Christian Stieffel, installed in 1839, Heidelberg Castle, first mentioned in 1225, red Neckar valley sandstone, north-east view from Scheffel Terrace in the castle garden, landmark of the city of Heidelberg on the Koenigstuhl north slope, Baden-Wuerttemberg, Germany Gate tower, height 40 metres, built in 1531, tower clock by Christian Stieffel, installed in 1839, Heidelberg Castle, first mentioned in 1225, red Neckar valley sandstone, north-east view from Scheffel Terrace in the castle garden, landmark of the city of Heidelberg on the Koenigstuhl north slope, Baden-Wuerttemberg, Germany Gate tower, height 40 metres, built in 1531, tower clock by Christian Stieffel, installed in 1839, Heidelberg Castle, first mentioned in 1225, red Neckar valley sandstone, north-east view from Scheffel Terrace in the castle garden, landmark of the city of Heidelberg on the Koenigstuhl north slope, Baden-Wuerttemberg, Germany Gate tower, height 40 metres, built in 1531, tower clock by Christian Stieffel, installed in 1839, Heidelberg Castle, first mentioned in 1225, red Neckar valley sandstone, north-east view from Scheffel Terrace in the castle garden, landmark of the city of Heidelberg on the Koenigstuhl north slope, Baden-Wuerttemberg, Germany