Dewatering tunnel north of Eisendorf<br>
The 100m long tunnel was build 1829 to dewater a lake and is still in use. The dewatered area has become farmland.
<a href="//commons.wikimedia.org/wiki/User:Hsuepfle" title="User:Hsuepfle">Harald Süpfle</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>