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Just an idea about why Henge structures were built: If you build a stone or timber circle (timber circles were commonplace at the same time as the circles) with the intention of watching shadows, then a clear impression is essential. However, if there's vegetation around the circle, a clear first gleam impression is exactly what you won't get.
You effectively have three options for a good sighting:
firstly, clear vegetation that might interfere with the sun or build where there are few obstructions
secondly incorporate a height-dependent sighting system
thirdly either embank the circle or stick a mound round it to cut off sunlight until the sun is well up over the horizon.
All the upland circles are built using the first method. I do not know of any circles using the second method, and the great lowland henges (which presumably had timber uprights instead of stone) used the "elevate the horizon" method.
Building a henge also has a very important religious purpose; it stops people outside looking in, which makes maintaining an air of mystery much easier for priests, who would've rather liked the feeling of power that gave.
Something is not right. This message is just to keep things from messing up down the road