RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
3,701 results for "H II region" — page 68 of 186
D_2_01 — Maltese Temple Builders and the Ħal Saflieni Hypogeum
The Maltese Temple Period (~3600–2500 BCE) produced the oldest free-standing structures on Earth — predating the Egyptian pyramids by ~1,000 years and Stonehenge by ~1,500 years. The tiny Maltese islands (316 km² total —
D_2_04 — Baalbek — Colossal Stones of the Bekaa Valley
Baalbek (ancient Heliopolis — "City of the Sun") is one of the most monumental archaeological sites in the ancient world, located in the Bekaa Valley of eastern Lebanon at the foot of the Anti-Lebanon mountain range. The
D_2_15 — Hattusa: Hittite Capital and Treaty Archives
Hattusa (modern Boğazköy/Boğazkale, approximately 150 km east of Ankara in north-central Turkey) — the capital of the Hittite Empire from approximately 1650 to 1180 BCE — was one of the greatest cities of the Late Bronze
D_1_04 — Complete Pyramid Catalog: Every Known Pyramid on Earth
This document examines Complete Pyramid Catalog: Every Known Pyramid on Earth, a topic within the Sites and Artifacts research area. Key areas of investigation include Egypt — 138+ Confirmed Pyramids, Sudan (Nubia/Kush)
D_1_23 — Carnac Stone Alignments: Europe's Largest Megalithic Complex
The Carnac stone alignments — located near the town of Carnac in southern Brittany, France — constitute the largest collection of megalithic standing stones in the world. Over 3,000 menhirs (upright stones) are arranged
D_1_25 — Ollantaytambo: Megalithic Engineering in the Sacred Valley
Ollantaytambo (Quechua: Ullantaytampu) is a monumental Inca archaeological site at 2,792 m elevation in the Sacred Valley (Urubamba Valley) of Peru, approximately 72 km northwest of Cusco. It served simultaneously as a r
D_1_16 — Göbekli Tepe Pillar Reliefs: Iconographic Analysis
The monumental T-shaped limestone pillars of Göbekli Tepe (southeastern Turkey, c. 9600–8000 BCE) bear the world's oldest known examples of monumental relief sculpture — an extraordinary corpus of carved imagery that pro
D_1_06 — Carnac, Avebury, and European Megalithic Alignments
Europe's megalithic tradition extends from Portugal to Scandinavia and spans roughly 4800–1500 BCE, encompassing thousands of stone circles, standing stones (menhirs), stone rows, dolmens, and passage tombs. The Carnac a
D_1_20 — Chankillo Solar Observatory: The Thirteen Towers
Chankillo is a 2,300-year-old ceremonial complex in the Casma Valley, coastal Peru, featuring a line of Thirteen Towers that constitute the oldest known solar observatory in the Americas and one of the most complete arch
D_1_05 — Stonehenge and the British Megalithic Complex
Stonehenge on Salisbury Plain, Wiltshire, is Britain's most iconic prehistoric monument, constructed in multiple phases between approximately 3100 and 1500 BCE — a span of over 1,600 years. The site features massive sars
D_1_07 — Teotihuacan — City of the Gods
Teotihuacan — the name itself meaning "the place where gods were born" in Nahuatl, given by the Aztecs who found the city already in ruins — was one of the largest cities in the ancient world, reaching a peak population
D_1_09 — Newgrange, Knowth, and Passage Tomb Astronomy
Newgrange, constructed around 3200 BCE in the Boyne Valley (Brú na Bóinne) of County Meath, Ireland, is one of the most remarkable Neolithic structures in the world — older than the Egyptian pyramids by approximately 700
D_1_21 — Cahokia & Monks Mound: North America's Largest Pre-Columbian Settlement
Cahokia, located near present-day Collinsville, Illinois, was the largest and most complex pre-Columbian settlement north of Mexico, reaching its peak between approximately 1050 and 1200 CE during the Mississippian cultu
D_1_18 — Taş Tepeler: Pre-Pottery Neolithic Ritual Network of Southeastern Turkey
Taş Tepeler ("Stone Hills") is a Turkish government-sponsored archaeological research program and site network encompassing at least 12 Pre-Pottery Neolithic (PPN) sites in the Şanlıurfa Province of southeastern Turkey,
D_1_17 — Cahokia & Monks Mound
Cahokia, located near present-day Collinsville, Illinois, was the largest pre-Columbian settlement north of Mexico and the center of Mississippian culture. At its peak around 1050–1200 CE, the city covered approximately
D_1_24 — Newgrange, Knowth, and Dowth: The Brú na Bóinne Complex
The Brú na Bóinne (Palace of the Boyne) — a UNESCO World Heritage Site in County Meath, Ireland — contains the three great passage tombs of Newgrange, Knowth, and Dowth, alongside approximately 40 smaller satellite monum
D_1_19 — Poverty Point: Louisiana's Enigmatic Archaic Earthwork Complex
Poverty Point is a Late Archaic period (approximately 1700–1100 BCE) earthwork complex located near the town of Epps in West Carroll Parish, northeastern Louisiana, on the Macon Ridge overlooking the floodplain of Bayou
D_1_03 — Megalithic Impossible Engineering
Ancient megalithic construction worldwide features stone blocks of extraordinary size and precision that challenge conventional explanations. Baalbek's Trilithon uses three 800-tonne stones set 7 meters above ground; Sac
D_1_22 — Pacific Island Megalithic: Nan Madol, Lelu Ruins, and Oceanic Stone Architecture
Nan Madol — a ceremonial complex of 92 artificial islets spread across a shallow lagoon off the southeast coast of Pohnpei (Federated States of Micronesia) — is one of the most enigmatic megalithic sites on Earth and has
D_5_23 — Chaco Canyon: Ancestral Puebloan Architecture and Astronomical Alignment
Chaco Canyon in northwestern New Mexico was the ceremonial, administrative, and astronomical center of the Ancestral Puebloan world from approximately 850 to 1150 CE. The canyon contains 12 "great houses" — massive multi
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