Archaeologists have discovered what may be the largest prehistoric monument in the entire United Kingdom, and it’s just a stone’s throw away from Stonehenge, a new study finds. 

By using a combination of remote sensing and hands-on excavation work, the team found evidence for at least 20 giant holes dating to the Neolithic, about 4,500 years ago. Each hole is massive, measuring at least 32 feet (10 meters) in diameter and at least 16 feet (5 m) deep. 

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