Baldern, medieval castle site

Baldern Castle 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 810 metres (2,660 ft) above sea level and about 4 kilometres (2.5 mi) south of the summit of Uetliberg. The earthworks are obscured by the site's woodland nature.

Source: Wikipedia (CC BY-SA 4.0) — https://en.wikipedia.org/wiki/Baldern_Castle