Also known as Mystery Hill, America's Stonehenge is located
about 40 miles north of the city of Boston, and about 25 miles
inland from the Atlantic Ocean. Running across the 30 acres of
hillside is a megalithic maze of low walls, cave-like primitive
buildings, and tunnels that are spread out in an unorganized,
seemingly random fashion.  While the hill is compared to the
English Stonehenge circle, it is physically quite different.
Stonehenge is located on a plain, not a hill, and is arranged
neatly as a series of concentric circles, horseshoes and
squares. Mystery hill is a jumble of disorder. The stones
involved in Stonehenge are larger, up to 45 tons. The stones at
Mystery Hill are smaller (the largest is about 11 tons) and the
construction less intricate.  However, both sites apparently
share some functions. Firstly, they served as observatories.
Each has been found to have astronomical alignments including
summer solstice. Secondly, almost nothing is known about the
builders of either location.  While the