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Williams Bay, Wisconsin
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The observatory's 40-inch refractor, completed in 1897, remains the largest of its kind in the world.
The observatory was designed by Henry Ives Cobb, featuring Romanesque and Gothic elements, making it a landmark in architectural history.
The observatory played a crucial role in the development of astrophotography, capturing detailed images of celestial objects.
The observatory provides educational tours and workshops, fostering interest in astronomy and science among students and the public.
Famous astronomers like Edwin Hubble and Carl Sagan conducted research at Yerkes, contributing significantly to the field of astronomy.