Are there any unmanned large telescopes located on Earth? I just read the answers to the question "Why are all space observatories in Chile?".  In addition to the reasons provided, one of the answers also mentions that


  ...if the telescope should be manned by humans permanently, it cannot
  be located to high due to the difficulty for humans to function at
  extremely high altitudes, ...


Which leads to my question:


  Are there any unmanned large telescopes located on Earth?


I realize that, even if large telescopes are unmanned, they probably need to be serviced by humans on a regular basis. But are humans needed permanently on site? 

I also realize that, even though there are humans monitoring the measurements from space telescopes, space telescopes are unmanned in the sense that there are no people at the space telescopes manning them.
The largest "robotic" (i.e., unmanned) telescope I'm aware of is the 2.4-meter Automated Planet Finder. Other large robotic telescopes include the 2.0-meter Liverpool Telescope and its copies (Faulkes Telescope North and Faulkes Telescope South). You can read about the automated control system of the Liverpool telescope here.

These are all located at existing observatories (e.g., APF at Lick Observatory, Liverpool Telescope at Observatorio del Roque de los Muchachos, La Palma, Canary Islands, Spain), which means there are people on site for potential maintenance work, etc., though said staff are really devoted to working on other telescopes.

The closest thing to an isolated, automatic telescope in an uninhabitable setting might be the small (0.5-m) Antarctic Survey Telescope at Dome A in Antarctica, which I believe is serviced annually by Chinese expeditions. It can apparently be remotely controlled via Iridium satellite communications, though actually retrieving the full data sets is part of what the annual expeditions are for.