Gradierwerk Bad Dürrenberg, Graduation tower in Bad Dürrenberg, Germany.
Gradierwerk Bad Dürrenberg is a long wooden structure designed to evaporate saltwater and concentrate minerals through natural air exposure. Brine flows gradually through layered blackthorn branches, which slow its descent and increase contact with air.
The tower was built in the 19th century when salt extraction through evaporation became a major industry in the region. This technique allowed larger quantities of salt to be produced more efficiently than earlier methods.
The structure reflects the salt-making traditions that shaped the local community for centuries. Visitors walking here connect directly with practices that once defined daily life and work in this region.
The best times to visit are early morning or late afternoon when fewer people are around and lighting is better for viewing and photos. The paths around the structure are level and easily accessible for visitors of varying abilities.
The structure ranks among Germany's longest of its kind and uses a specially arranged wood system that guides saltwater for optimal evaporation. Many visitors overlook that the blackthorn branches were specifically chosen because their rough surface naturally encourages mineral concentration.
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