World Telescopes
Largest does not always equate to being the best telescopes, and overall light gathering power of the optical system can be a poor measure of a telescope's performance. Space-based telescopes, such as the Hubble Space Telescope, take advantage of being above the Earth's atmosphere to reach higher resolution and greater light gathering through longer exposure time. Location in the northern or southern hemisphere of the Earth can also limit what part of the sky can be observed.
https://en.wikipedia.org/wiki/List_of_largest_optical_reflecting_telescopes
http://astro.nineplanets.org/bigeyes.html
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