Virgo is a Gravitational Wave detector consisting of a large laser Michelson Interferometer in Italy. It aims at the 10-10000 hertz Frequency range, presumed to detect supernovae or coalescence of binary systems in the Milky Way and other Local Group galaxies. It is part of the European Gravitational Observatory.
It consists of laser beams enclosed in 3km vacuum chambers reflected multiple times to produce 100km paths, designed to detect minute changes in distances due to gravitational waves.
European Gravitational Observatory (EGO)