Baldern Castle - Credit: Wikimedia Commons
Baldern Castle ( or Burgstelle Baldern) is a former castle in the municipality of Stallikon and the canton of Zürich in Switzerland. The remains of the castle comprise a set of earthworks, situated on the Albis ridge at some above sea level and about south of the summit of Uetliberg. The earthworks are obscured by the site's woodland nature. Read more on Wikipedia
Source: en.wikipedia.org