🇺🇸 United States · Earthwork
Cahokia Woodhenge
Mississippian Emergent–Early 900–1150 CE · Mississippian (Cahokia)
Mississippian timber Stonehenge: 410 m 48-post solar calendar aligned to Monks Mound solstice.
🇬🇧 United Kingdom · Megalith
The Sanctuary (Overton Hill)
Late Neolithic – Early Bronze Age · Windmill Hill / Wessex Neolithic
Timber-then-stone double circles (40 m outer) at SE end of West Kennet Avenue — Avebury's mortuary terminus.