The relief carving Descent from the Cross (Kreuzabnahmerelief an den Externsteinen) is the most interesting of the artwork at the Externsteine. It measures nearly 5 m high by 4 m wide. Current thinking dates it to around 1160 making it the oldest such large relief rock carving north of the Alps.
Wikimedia Commons / https://en.wikipedia.org/wiki/File:Externsteine_Relief_1862.jpg