German Renaissance Master Albrecht Altdorfer Pioneered Landscape Painting. A Work Previously Unknown to Scholars Just Emerged After 70 Years in a Private Collection
Painted around 1520, the newly identified painting is one of only three pure landscapes painted in oil by the artist. It depicts a lush forest scene with castle ruins and a rainbow emerging from stormy skies
We haven't written up this one. Smithsonian has the full story — the link below goes straight to it.