Gradierwerk Bad Dürrenberg, Graduation tower in Bad Dürrenberg, Germany.
Gradierwerk Bad Dürrenberg is a long wooden graduation tower in Bad Dürrenberg, Germany, built to concentrate brine by letting it trickle slowly through layered blackthorn branches. The structure stands several meters tall and runs for a considerable length, with the wood framework open on the sides to allow air to pass through freely.
The graduation tower was built in the 19th century, when the salt industry in Bad Dürrenberg was at its height and large-scale brine evaporation was a key part of local production. The site had been linked to salt extraction for much longer, with brine springs in the area drawing industrial interest well before the current structure was erected.
People come to walk along the structure not just to look at it, but because the salty air near it is noticeable and refreshing. The fine spray that forms as brine drips through the wood creates a light mist you can feel on your skin.
The structure sits in an open area in Bad Dürrenberg and can be visited throughout the year, though walking near it on a breezy day gives a better sense of how it works. A path runs along its length, making it easy to walk the full stretch and see the wood framework up close.
The blackthorn branches inside the structure are not permanent and need to be replaced over time because the constant flow of brine gradually breaks down the wood. This means the framework you see today is not the original material but a regularly renewed version of it.
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