The Jahlava Labyrinth, or underground passages, is spread throughout the city, with a total length of about 25 km. It was found under almost all the houses in the historical part of the city, and therefore it has been declared a municipality protected area. What distinguishes these corridors most is the bright lighting that emerges from their walls in the dark, which is believed to be due to the presence of a chemical that emits this light, and you can take a tour inside the corridors to learn about them and their history and it takes 40-50 minutes.