Painted markings inside a Welsh cave have been confirmed as Britain's oldest known rock art after being written off as a natural quirk a century ago. The horizontal red bands adorning the walls of Bacon Hole, near the Mumbles on the Gower peninsula, date back approximately 17,100 years. An international team of archaeologists used dating techniques to establish the age of the pigments, supporting the original assessment that the markings represented genuine prehistoric cave paintings. Professors