Cueva de La Pasiega
The Cueva de La Pasiega is located in the province of Cantabria, Spain. This cave may be as much as 40,000 years old.
The picture above is known as The Inscription of La Pasiega. I have included the image here because there is what looks like a pictograph of shackled feet, accompanied by an inverted balance scale. If you invert a balance scale, you can weigh heavier items. This would seem to imply that the crime committed was of a serious nature.
Image Credit: Panel number 49, Gallery B: Hugo Obermaier: Breuil, Henri; Obermaier, Hugo y Alcalde Del Río, Hermilio, 1913: La Pasiega à Puente Viesgo: Ed. A. Chêne, Mónaco: Source: Wikimedia Commons: http://en.wikipedia.org/wiki/File:La_Pasiega-Galeria_B-La_Inscripcion.png: Accessed: 21 January 2013