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Tagsacoustic
2 places carry this tag, across every kind and continent it appears in.
🇲🇹 Malta · Megalith
Late Neolithic – Chalcolithic · Maltese Temple culture (Żebbuġ to Tarxien)
Three-level underground necropolis/sanctuary carved in limestone, 10.6 m deep, halls including Oracle Room with acoustic resonance. Only prehistoric underground temple in world.
🇬🇧 United Kingdom · Megalith
Late Neolithic · Grooved Ware Orcadian
Massive henge and stone circle 104 m diameter, originally 60 stones (36 surviving). Enclosed by rock-cut ditch up to 10 m wide. Core of Heart of Neolithic Orkney.