Maastricht Underground is a unique underground attraction in Maastricht, the Netherlands, which includes tunnels, mines and fortress ruins on St. Peter's Hill. These winding passages have served as wartime shelters and secret transportation routes, witnessing the city's historical changes. Visitors can explore this labyrinthine underground world under a guided tour, experience the silence and mystery of the underground, and learn about the rich cultural and military heritage of southern Netherlands. This is not only a journey through history, but also a window into the soul of Maastricht.