  We construct non-supersymmetric AdS3 solutions of the O(16)xO(16) heterotic
string. Most of the backgrounds have a classical worldsheet definition but are
quantum string vacua in the sense that string loop corrections change the
curvature of spacetime. At one-loop, the change in the cosmological constant is
positive but never sufficient to uplift to de Sitter space. By computing the
spectrum of spacetime scalars, we show that there are no tachyons below the BF
bound. We also show that there is a solution with no spacetime NS-NS flux. This
background has no classical string limit. Surprisingly, there appears to be
parametric control over these constructions, which provide a framework for
exploring quantum gravity and holography without supersymmetry.
