Não sei alemão e não sei se pode ajudar:
http://www.proz.com/kudoz/english_to_german/tourism_travel/6..."The term “dark heritage” is relatively young; the principle, however, is old: the recognition (or assignment) of an importance of sites and monuments to remind of negative aspects of the past.
Since 2005, the Siegfried Line in Baden-Württemberg is protected as a historical monument. Not because it is particularly beautiful, but because it is a part of our “dark” heritage. After pondering this a little while, I realized that the definition of a site or monument as “dark” heritage depends on context, appropriation and attribution:"
https://blogxbp.wordpress.com/2012/11/03/10/