Megalithic similarities of Northern America and Northern Europe

Or: Мегалитические сооружения Северной Америки

Similarity megaliths, types, principles, systems of construction, accompanying designs

At the left - America (northeast  USA and Canada), on the right - northern Europe (Scandinavia and north Russia areas: Karelia, Lapland, Ural)

Similar megalithic consrtuction and structures are available on all northern hemisphere of the Earth.

 Base types of construction:

dolmen (tripod rock), perched boulders, rock-on-rock, twins-stones, split-wedged rock, cairn (platform, round), aligned boulder (small rock wall), stones boats (ships), stone piles, prayer seat, balanced rock, nishe, chamber... 
Landscape features:

stones and systems on rocks 
Systems of construction from boulders:

line, triangle, circle

http://perpettum.narod.ru/inaks.htm