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Stonehenge on the Salisbury Plain, Wiltshire. Its construction was a multi-phased effort beginning in the Neolithic, about 2600 BC, and ending in the Middle Bronze Age, about 1800 BC. Its opening toward a point of sunrise at the time of the summer solstice, together with the alignment of the stones according to certain solar or lunar phenomena, makes it likely that Stonehenge was a center of sun worship. An astronomer, using a high-speed computer, interpreted Stonehenge even as being itself a Neolithic computer with the aid of which astronomer-priests were able to predict exactly the succession of the seasons and the eclipses of moon and sun. Today Stonehenge is of iconic quality, England's most visited monument and a World Heritage site. England. (KEYSTONE/Georg Gerster)