🇬🇧 United Kingdom · Megalith
Lanyon Quoit
Early Neolithic · Penwith Early Neolithic
Penwith portal dolmen — 5.5 m capstone (12 t) on three 1.5 m uprights, collapsed 1815 and reset lower.
🇫🇷 France · Megalith
Dolmen de Bagneux
Middle Neolithic · Loire Neolithic / Chambon group
Largest French dolmen — 23 m long passage of taf limestone slabs with 40-tonne capstones near Saumur.
🇪🇸 Spain · Megalith
Dolmen de Guadalperal — Spanish Stonehenge Variant West Bank
Chalcolithic to Early Bronze Age · Tagus Megalithic
Megalthic dolmen (c. 2000–3000 BCE) on Tagus terrace, first recorded by Obermaier, submerged under Valdecañas reservoir and exposed in drought.