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Einstein Telescope is a concept for a larger LIGO-like gravitational-wave observatory, with arms 10 km in length (c.f., LIGO's 4-km arms), a plan for a subsequent generation of detectors in the late 2020s and early 3030s. Like KAGRA, it would be underground. The design has three arms in an equilateral triangle, for three Michelson interferometers using 60 degree angles. And the plan calls for two such sets of interferometers using the same tunnels (totaling six interferometers in all), each set-of-three tuned so as to be optimized for a different frequency range. The additional length contributes to the sensitivity, the goal being to detect more sources such as those more distant, those weaker at the source, and those with frequencies at which LIGO sensitivity is poor.
An alternate such plan is Cosmic Explorer.
Note that other telescopes/observatories have been named Einstein, including the 1970s NASA X-ray satellite, Einstein Observatory, and China's current X-ray Einstein Probe satellite.