The three Gleichen castles were the seat of the County Gleichen, in addition to fortresses belonging to the Abbot of Hersfeld and the Margraves of Thuringia. The castles guarded the important trade route of the Via Regia, and were subsequently besieged and destroyed multiple times over the course of history. Today, the three castles form a dramatic landscape in the Thuringian basin that is also easily accessible. Take a high-speed train from Frankfurt to Berlin through Erfurt, and you will see them as you pass by. This hike takes you on a trip to visit all three.