Burg auf einem Felssporn an einem Gewässer 

This is a preliminary drawing, possibly a study for a larger painting, by Dutch artist Anthonie Waterloo (1610-1690). The drawing is titled "Burg auf einem Felssporn an einem Gewässer" (Castle on a Rocky Spur by a Body of Water) and showcases a castle perched atop a steep cliff. The soft grey tones and sketchy lines give a sense of immediacy, like a snapshot of a moment in time. The drawing's focus on the castle's architectural details and surrounding landscape reflects the artist's interest in topographical studies, a popular genre in 17th-century Dutch art. It is currently on display at the Städel Museum.