The Ehrenberg is a hill to the east of Ilmenau, rising to a height of 528 metres and standing opposite the Tragberg. The border between Ilmenau and Langewiesen runs over its summit, which is marked by a large wooden cross. It is home to part of the campus of the Technische Universität Ilmenau and the Bundesanstalt für Wasserbau . On 22 July 2006, around 6,000 square metres of the Ehrenberg were destroyed in a forest fire, although damage to buildings was limited. The body of the Ehrenberg itself is notable geologically for containing hydrobiotite, sometimes also called voigtite.
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