Fulbert-Stollen, Medieval water drainage gallery near Laacher See, Rhineland-Palatinate, Germany
The Fulbert-Stollen is a medieval water drainage gallery in the Eifel region of Rhineland-Palatinate, cut through volcanic rock beneath the Laacher See area. The passage runs for about 880 meters and carries water from the lake toward a neighboring pond.
Work began in 1160 under Abbot Fulbert of Maria Laach monastery, with the aim of preventing flooding and opening up the surrounding land for use. This made the project one of the most consequential engineering works carried out by any religious house in the region at that time.
The tunnel takes its name from Abbot Fulbert, who ordered its construction in the 12th century, keeping alive the memory of the monastery's role in shaping the local land. At the entrance, visitors can still see water flowing through the rock, making the connection between the abbey, the lake, and the surrounding area tangible.
The interior is dark and damp, so a flashlight and sturdy footwear are strongly recommended before entering. The floor can be slippery in places, so moving slowly and carefully makes the visit much more comfortable.
The digging of this tunnel lowered the level of the Laacher See enough for the monks to gain large areas of new land along the former shoreline. The water still follows the same path today that it has followed since the Middle Ages.
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