Three huge millstone grit megaliths on the western outskirts of Boroughbridge, known as the Devil’s Arrows, are between 18ft and 22ft 6ins high (the tallest being higher than Stonehenge). The stones date from c. 2000bc and it is believed that they were either part of a henge one mile in diameter or part of a single row (similar to those found in Carnac, Brittany) aligned with the southernmost summer moonrise.