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The ancient UK artefact that logged ALIEN visitors? - Ancient Aliens

A large cuboid stone covered in ancient markings

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In Oxford sits an ancient artefact that has names of potential alien visitors to Earth from centuries past. Ancient Aliens examines 75 million years of the most credible alien evidence here on Earth: from the age of the dinosaurs, to ancient Egypt, to the skies over the western desert in the present day US, ancient cave drawings of strange creatures, an asphalt-like substance in an Egyptian pyramid made from the remains of unidentified creatures, continued mass sightings in the USA.