Once upon a time …. the members of the European Southern Observatory (ESO) decided to build a Very Large Telescope in Chile. It’sthe start of a great story.
There are 4 telescopes (Antu, Kueyen, Melipal and Yepun) who work together imaging astronomic phenomenons 25 times better than with the individual telescopes. They’re huge. The mirrors have a diameter of 8.2 m!!! The telescopes are situated in Chile, high in the mountains, with the clearest skies on our planet.
A lot of research is already done with the VLT. You may find more information on the ESO website, which contains a couple of very useful links (especially about the science with the telescopes). http://www.eso.org/public/teles-instr/vlt/
Tours are available under certain conditions: http://www.eso.org/public/about-eso/visitors/paranal/
Now I leave you with some of the most beautiful pictures of the VLT (credit ESO website)