Cyclopean walls were Bronze Age dry-stone construction, and mortar was older

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Key facts

• Cyclopean masonry appears in Bronze Age Mycenaean architecture, built from massive limestone boulders roughly fitted together without mortar.
• Some floors in Göbekli Tepe's oldest layer, roughly 11,500–12,000 years old, are burnt-lime terrazzo; the whole site was not paved with terrazzo mortar.
• Clay and mud mortar traditions predate the Bronze Age, but the claim that cow-dung mortar was as old as building itself is too broad to state as a precise archaeological fact.
• By the Bronze Age, builders regularly used non-hydraulic lime mortar, a material that can perform well in masonry.
• Cyclopean and related dry-stone construction persisted beyond the Bronze Age and did not go extinct when Roman concrete appeared.
• Roman concrete used hydraulic lime and pozzolana; its use declined in parts of post-Roman western Europe, but the technology was not simply lost after the empire's fall.
• Hydraulic lime was ancient by Roman times. John Smeaton developed a hydraulic lime mortar in 1756 for the Eddystone Lighthouse; star forts were older and were not enabled by a new 1756 invention.
• Non-hydraulic mortar does not inherently make thick walls collapse; performance depends on the material, exposure, detailing, and drainage.

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