  The Liquid Argon Time Projection Chamber offers an innovative technology for
a new class of massive detectors for rare-event detection. It is a precise
tracking device that allows three-dimensional spatial reconstruction with
mm-scale precision of the morphology of ionizing tracks with the imaging
quality of a "bubble chamber", provides $dE/dx$ information with high sampling
rate, and acts as high-resolution calorimeter for contained events. First
proposed in 1977 and after a long maturing process, its holds today the
potentialities of opening new physics opportunities by providing excellent
tracking and calorimetry performance at the relevant multi-kton mass scales,
outperforming other techniques. In this paper, we review future liquid argon
detectors presently being discussed by the neutrino physics community.
