The castle ruins of Hazmburk (German: Hasenburg) stand on the 418 m high mountain of the same name. It is an important dominant of the lower Ohře region and offers a unique panoramic view of the Bohemian Central Mountains as well as the lowlands to the south. On a clear day, you can look to the east as far as to Jěštěd mountain near Liberec.
The castle ruins are dominated by the massive, 26 m high "White Tower". In contrast to the lower, round "Black Tower", it has a square ground plan. Today, the "White Tower" is also mainly black, but bears its name thanks to the originally bright sandstone from which the upper floors were built. However, due to weathering it has also become black in the meantime.
The castle was built in the late 13th century, but was not used for very long. After the Hussite Wars in the 15th century, during which it was besieged several times without success, the castle was abandoned and it fell into ruins.
The "White Tower" is currently open for the public and serves as a lookout tower.