🇺🇸 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 · Archaeological wonder
Casa Grande Ruins National Monument
Classic Hohokam 1150–1450 CE (Sedentary to Classic transition) · Hohokam (Ancestral Sonoran Desert, ancestors of O’odham)
Ancestral Sonoran Desert four-story Great House (18 m × 13 m, 4 storeys, 11 rooms, caliche clay walls 1 m thick, internal loopholes) – largest known Hohokam structure, preserved under 1932 modern…
🇺🇸 United States · Ancient city
Peñasco Blanco — Chaco Canyon Outer Great House West
Pueblo II–III (1050–1140 CE) · Ancestral Pueblo (Chacoan)
Cliff-point Great House 1050 CE — oval arc & solstice pictograph.
🇺🇸 United States · Archaeological wonder
Chaco Culture National Historical Park
Pueblo II–III 850–1250 CE (Chacoan fluorescence 1020–1140) · Ancestral Puebloan (Anasazi) / Chacoan
Chacoan canyon with 15 monumental Great Houses (Pueblo Bonito 650 rooms, 35 kivas) and engineered roads, built 850–1150 CE by Ancestral Puebloans as ritual and trade center for San Juan Basin,…
🇺🇸 United States · Earthwork
Moorehead Circle at Fort Ancient
Middle Woodland Hopewell (c.100 BCE–250 CE) with Fort Ancient reuse · Hopewell → Fort Ancient
Outer-embankment timber circle 60 m diameter discovered 2007 by magnetometry inside Fort Ancient Hilltop Enclosure (Hopewell 100 BCE–500 CE, later Fort Ancient reuse).
🇺🇸 United States · Earthwork
Great Serpent Mound
Disputed: either Adena 320 BCE–200 CE or Fort Ancient 1070–1200 CE (latest C14 favors Fort Ancient 1120 CE) · Adena culture or Fort Ancient culture
Quarter-mile (411 m) effigy mound in shape of serpent with oval head swallowing an egg, 3 ft high, coiled tail atop meteor-crater plateau above Ohio Brush Creek, largest surviving effigy mound in…