🇬🇧 United Kingdom · Earthwork
Meare Heath Trackway
Late Neolithic 3240 BCE · Late Neolithic Somerset Levels farmers
Neolithic timber trackway (3240 BCE, 2 km) at Meare Heath, longest Neolithic timber structure in Britain, successor to Sweet Track.
🇸🇪 Sweden · Earthwork
Bulverket Lake Fortress (Tingstäde Träsk, Gotland)
Early Middle Ages (c.1120–1150 CE) · Medieval Gotlandic
Massive 1130s timber platform fortress in Tingstäde Träsk lake, Gotland: 170 × 170 m square bulwark of ca. 25,000 pine logs forming a square grid with causeway to shore.
🇺🇸 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.