La Silla observatory. Telescope domes at the European Southern Observatory (ESO) site at La Silla, Chile. The four buildings from centre left to centre right contain: the 2.2-metre telescope, the Schmidt 1.0-metre telescope, the 3.5-metre New Technology Telescope (NTT), and the 3.6 metre telescope with its auxiliary 1.4 metre telescope in the tower beside it. In the background at right is the dish of the Swedish-ESO Submillimetre Telescope (SEST).