A new archaeological discovery at King Arthur's Hall in Bodmin, Cornwall, suggests the site dates back to the early Neolithic period 5,500 years ago, predating the legend of Arthur by thousands of years. The stone structure, previously believed to be a medieval animal pen, could be older than Stonehenge and is considered unique in the U.K. and Europe. Excavations revealed the site's interior was dug around 3,000 B.C., significantly older than previously thought.