There is also a project called GEO600 in Germany that is collaborating with LIGO (and therefore also Virgo/KAGRA). This detector is much smaller though. https

There is also a project called GEO600 in Germany that is collaborating with LIGO (and therefore also Virgo/KAGRA). This detector is much smaller though. https://en.m.wikipedia.org/wiki/GEO600 https://en.m.wikipedia.org/wiki/GEO600