For a century, experts dismissed a series of parallel red lines discovered in a Welsh cave as a phenomenon of nature rather than human-made rock art. But a new study shows the lines are a rare example of Paleolithic art — and at 17,000 years old, they're the earliest example of rock art in the British Isles.
Bacon Hole is a cave in the limestone cliffs of Gower, a peninsula in southwest Wales. In 1912, a team of geologists and archaeologists found a panel deep within the cave covered in a series of 11 horizontal lines.
