It's not just Europe that has standing stones and the like:
The Mystery Hill complex, the largest and most sophisticated of its kind in North America, covers over 30 acres and is composed of monolithic standing stones, stone walls and underground chambers, most of which are aligned to obvious astronomical points.
...noted archaeo-astronomer Byron Dix has determined that New England is replete with underground chambers. He says, ". . . there are some 105 astronomically aligned chambers in Massachusetts, 51 in New Hampshire, 41 in Vermont, 62 in Connecticut, 12 in Rhode Island, and 4 in Maine.
