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Like long barrows, causewayed enclosures and henges can at first be difficult to see, and are more easily recognisable from above.
But once you see them, you realise what an incredible feat of engineering they were.
Both types of monument have the same idea.
Causewayed enclosures are a series of large concentric ditches, broken by passageways.
It's thought they were probably used by communities to gather for ceremonies, as thousands of cattle and sheep bones were found on site.
Building causewayed enclosure was a monumental endeavour, as humans only had stone axes and deer antlers to work with.
Windmill Hill covers 20 acres and would have taken 62,000 hours to build!
There are more than 70 of these across the UK - Windmill Hill is the largest.
