2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60947We show that the metric of nonpositively curved graph manifolds is determined by its geodesic flow. More precisely we show that if the geodesic flows of two nonpositively curved graph manifolds are $C^0$ conjugate then the spaces are isometric.9 pages, latex fileDifferential GeometryDynamical Systems53C20;53C20;37D40text