The ALMA Observatory was built in the Chajnantor Plateau over 5000 meters above sea level and is currently operational. In this image: antennas located in the Central Cluster. In their construction stage, there are a total of 118 foundations, spread out across 32 km in diameter for 66 antennas. Credit: Ariel Marinkovic – ALMA (ESO/NAOJ/NRAO)