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Nice observatory, France. Mount Gros, near Nice, France, by banker Raphael Bischoffsheim. The telescope it housed (a 77-centimetre refractor) was the first to be built at altitude (372 metres above sea level), and was one of the largest in the world at the time. The main dome (centre left, the Bischoffsheim cupola) is 24 metres across (96 tons), designed by Gustave Eiffel to use water flotation. Other buildings (with work by the architect Charles Garnier) include a smaller dome (upper right), and the main buildings on the southern slopes (lower centre).
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