Impressions of a roman Long Wall that dates back to the 4th century

Long wall of an agricultural district in Herforst, Eifel, Germany

The area around Herforst was inhabited in pre-Roman times. The Long Wall is a Roman fortification dating back to the 4th century, which was built under the late Roman Emperor Valentinian I (364 - 375 AD). The wall had a total length of around 72 km and was intended to protect a late antique imperial domain covering an area of around 220 km². 

As the fortification had a maximum height of around two meters, it is assumed that it served more as protection against invading game than for purely military purposes. This theory is supported by the fact that the wall encloses an area with limestone soil, which is one of the most fertile in the Trier region.

 Information provided by the University of Trier

Geranium robertianum, aka Roberts geranium, is a common species of cranesbill native to Europe. It grows as a procumbent to erect annual or biennial plant, up to fifty centimetres high, producing small, pink, five-petalled flowers (8–14 mm in diameter).