Hazmburk (German: Hasenburg, literally "Hare Castle") is a solitary hill in the Lower Ohře Table plateau with an elevation of 429 m (1,407 ft).
At the top of the mountain there is the ruin of a medieval castle, of which two towers and some wall fragments are still standing.
Zbyněk Zajíc considerably enlarged and extended the castle, and in particular added the two prominent towers which survive to this day.
After these wars, it apparently fell into disuse and gradually was reduced to a ruin: records from the year 1586 already describe it as desolate.
The taller of the two towers features an observation deck, and the view of the surrounding countryside that can be had from there is quite spectacular.