2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202182All Lorentzian spacetimes with vanishing invariants constructed from the Riemann tensor and its covariant derivatives are determined. A subclass of the Kundt spacetimes results and we display the corresponding metrics in local coordinates. Some potential applications of these spacetimes are discussed.24 pagesGeneral Relativity and Quantum Cosmologytext