Kleiner FeldbergThe Kleiner Feldberg is the second-highest mountain in the Taunus mountain range, located in Hesse, Germany. It has an elevation of. The Großer Feldberg is located in its immediate neighbourhood.ObservatoryIn 1913, a meteorological and geophysical observatory was built there by German meteorologist Franz Linke. In 1988 an astronomical observatory was built on the mountain's top.SurroundingsThe source of the Weil River and a small castle of the Limes Germanicus are located at its northern base.