The largely preserved medieval city wall of Chojna is now a listed building. Königsberg/Neumark was fortified in the 14th and 15th centuries. These were supplemented by three gates and numerous defensive and watchtowers. Despite considerable war damage in World War II, the city wall in Chojna remained almost completely intact. Two gates have survived to this day. One, the Bernikower Gate, took its name from the village of Berniko. It was built in the 14th and 15th centuries. The second preserved gate is the Schwedter Gate, Brama Swiecka, built in the 15th century and is considered one of the most beautiful Gothic city gates in the country. The city fortifications also included numerous towers, three of which have been preserved: Baszcza Piekarska, Więzienna and Bociania (Baker's, Prison and Stork Tower). The Billerbeck Tower, which was also called the Prison or Powder Tower, is located on the northern city wall.