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Stonehenge, England:
A place shrouded in mystery, even today we still do not know definitively why this structure was constructed.
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If you ever go, make sure you see the surrounding area and find out about the relevance of Stonehenge wrt to its landscape. You can walk around most of the fields and, if you look closely, can follow the avenues. Also, access is restricted most times of the day, see if you can get on an early (7-8am) tour to actually get in the middle.