Maen Llia, an ancient standing stone in the Llia valley, Brecon Beacons, Powys, South Wales. The stone is a massive sandstone block which stands 3.7m high. It is roughly diamond-shaped and is partly moss-covered. Its age and original purpose are unknown though it is thought to date from the Bronze Age. It is a popular tourist attraction run by Brecon Beacons National Park. (photo by Andrew Aitchison / In pictures via Getty Images)
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