As with long barrows, causewayed enclosures can be difficult to spot, but are very easily recognisable from above.
But once you see them, you have to appreciate the incredible feat of engineering they represent.
Causewayed enclosures are a series of large concentric ditches, interrupted by passageways.
They were likely used to gather communities for ceremonies and feasting, as evidenced by the thousands of cattle and sheep bones found on site.
Constructing them was also a monumental task, as the only available tools were stone axes and deer antlers.
More than 70 causewayed enclosures have been discovered across the UK.
Windmill Hill is the largest.
It covers around 20 acres and would have required approximately 60,000 hours to build!
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