https://www.technologyreview.com/2020/07/13/1005090/astronomers-found-giant-intergalactic-wall-south-pole-wall

Astronomers have found one of the largest structures in the known universe—a “wall” of galaxies that’s at least 1.4 billion light-years long. And given how close it is to us, it’s remarkable that we haven’t seen it before now.