🇬🇧 United Kingdom · Megalith
Carreg Samson Dolmen
Early Neolithic (c.3800–3600 BCE) · Western Neolithic (Pembrokeshire)
Cliff-top portal dolmen near Abercastle harbour — massive capstone (4.7 m) on three orthostats with sea backdrop.
🇬🇧 United Kingdom · Megalith
Coetan Arthur at St Davids Head
Early Neolithic (c.3800–3600 BCE) · Western Neolithic (Pembrokeshire)
Headland portal dolmen (capstone 5 x 3 m) on St Davids Head cliff overlooking Whitesands Bay — Neolithic coastal tomb.
🇬🇧 United Kingdom · Megalith
Crosskirk Broch
Early Iron Age to Norse (c.600 BCE–900 CE) · Atlantic Iron Age / Norse
Eroded Caithness cliff broch with early fort, broch tower and Norse layers; half lost to sea after 1960s excavation.
🇬🇧 United Kingdom · Megalith
Midhowe Broch
Iron Age (c.200 BCE–200 CE) · Atlantic Iron Age (Orcadian)
Finely preserved Rousay broch on Eynhallow Sound with intramural galleries and adjacent chambered cairn.