There are two LIGO interferometers in the US [0], Virgo in Italy [1], GEO600 in Germany [2], something in Japan [3] and something being planned out being built

There are two LIGO interferometers in the US [0], Virgo in Italy [1], GEO600 in Germany [2], something in Japan [3] and something being planned out being built in India. There is LISA as space-based project in the works too [4]. [0] https://en.m.wikipedia.org/wiki/LIGO https://en.m.wikipedia.org/wiki/LIGO [1] https://en.m.wikipedia.org/wiki/Virgo_interferometer https://en.m.wikipedia.org/wiki/Virgo_interferometer [2] https://en.m.wikipedia.org/wiki/GEO600 https://en.m.wikipedia.org/wiki/GEO600 [3] https://en.m.wikipedia.org/wiki/KAGRA https://en.m.wikipedia.org/wiki/KAGRA [4] https://en.m.wikipedia.org/wiki/Laser_Interferometer_Space_Antenna https://en.m.wikipedia.org/wiki/Laser_Interferometer_Space_A...