The following pick is from the ESO webcam (at Cerro Paranal) overlooking Cerro Armazones. It shows the state of ground works for the E-ELT which is scheduled for completion in 2024. The telescope will operate in the optical and infrared spectrum with a diffraction limited 3' field of view. The primary mirror will have an aperture of 39m. To put that in to perspective, the AAT at Siding Springs is approximately 1 power of 10 larger than a 16" telescope. The E-ELT is 1 power of 10 larger than the AAT.
https://www.eso.org/public/archives/...I/preset_1.jpg
http://www.eso.org/public/teles-instr/e-elt/