Cave of El Castillo

The Cueva del Castillo, or Cave of the Castle, is an archaeological site within the complex of the Caves of Monte Castillo, in Puente Viesgo, Cantabria, Spain.

The archaeological stratigraphy has been divided into around 19 layers, depending on the source they slightly deviate from each other, however the overall sequence is consistent, beginning in the Proto-Aurignacian, and ending in the Bronze Age.

The El Castillo cave contains the oldest known cave painting: a large red stippled disk in the Panel de las Manos

Source: Wikipedia