🇺🇸 United States · Archaeological wonder
Fajada Butte
Pueblo II–III Bonito 1000–1150 CE · Ancestral Pueblo (Chacoan)
Chacoan Sun Dagger butte: three slabs create dagger beam on spirals marking solstices and lunar standstill.
🇺🇸 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.
🇬🇹 Guatemala · Pyramid
Uaxactún Group E Observatory (E-Group)
Middle Preclassic to Late Classic (1000 BCE–900 CE; E-Group 600–300 BCE) · Maya (Preclassic then Tikal sphere)
Type-site of Mesoamerican E-Group solar observatory: western radial pyramid E-VII (Late Preclassic 500 BCE) aligning via three eastern platforms to sunrise solstices/equinoxes, deliberate horizon…
🇵🇪 Peru · Archaeological wonder
Chankillo — Second Thirteen Towers Sector
Early Horizon–Early Intermediate Casma Sechín 250–200 BCE · Casma/Sechín (Punkurí tradition)
Second Thirteen Towers line 400 m east of famous solar observatory, with observing building and bastions.