I have heard no such thing...at least not optically.
You can have really, really, really huge "telescopes" by having an array of many dishes scanning the sky for radar waves. While you can't have a single dish that big (it gets crushed under it's own weight), but you can create an array of many telescopes that, when arranged correctly, perfectly simulate a telescope with much larger aperture.
These telescopes check for radio waves, which have a much lower frequency and are not really affected by the atmosphere at all. As far as I know though, the Hubble Space Telescope is the biggest telescope that checks in the visual spectrum.