Zvikov Castle – originally a small complex, the castle was continuously extended until 1278. After the Premyslid dynasty died out in 1306, Zvikov became property of the Rozmberk family. After 1337 the settlement under the castle has been fortified, as a part of thorough repairs. Its fortifications were so strong that even the Hussites, during the Hussite Wars, besieged it for four months in 1429, but found it a tough nut to crack and failed to take it. To protect against heavy artillery its walls were further strengthened.