Great Paris Exhibition Telescope of 1900
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The Great Paris Exhibition Telescope of 1900, with an objective lens of 1.25 m in diameter, was the largest refracting telescope ever constructed. It was built as the centerpiece of the Paris Universal Exhibition of 1900. Wikipedia
Focal length: 57 m (187 ft 0 in)
Location(s): France
Telescope style: optical telescope; destroyed building or structure