Here the path is crossed by WW2 anti-tank fortifications. I cannot see them on OSM, at least on Osmand and Vespucci. They run from the path to SE for 100m, where they become railway steel bars planted in the ground and veer SW uphill into the wood. On the right side of the path they are steel bars straightaway and run NW for at least 20 meter, then I can't see.

via StreetComplete 49.0

Attached photo(s):
https://westnordost.de/p/120907.jpg
https://westnordost.de/p/120908.jpg
https://westnordost.de/p/120909.jpg
https://westnordost.de/p/120910.jpg
https://westnordost.de/p/120911.jpg