Start of the Virgo north arm; in the foreground on the right, the central building.
室女座干涉儀的3 km长北部长臂。
The Virgo site with, in the foreground, the building which hosts the detector control room and the local computer center.
The Virgo central building which hosts the laser and the beamsplitter mirror.
View of the 3 km-long Virgo west arm (right pipe). The tube on the left, which is 150 m-long, hosts the mode-cleaner cavity which is used to filter spatially the laser beam.