Szczecin - Underground City Trails Museum allows the general public to access the WWII German Bunker under Szczecin's main train station. Today, it is the biggest civic shelter in Poland and is opened everyday all year round. The most unique part of this bunker, as it is with others around the city, is the countless tunnels that interconnect with eachother. Guided trips depart always at 12:00 and last approx. 1,5hrs.