The ruins of the castle Přimda standing on top of a rocky ridge above the town in the northern part of the Bohemian Forest. The first mention of Přimda comes from the year 1121; Přimda is thus considered the oldest stone castle in the country. Although the builder of the castle was probably German margrave Děpolt II. of Vohburg, but no later than in 1126 already included Přimda Czech rulers as an important border fortress, which guarded the trade route from Prague and Pilsen in the Upper Palatinate. In addition, it served as a royal prison, where he was forced to stay among other things, later King Ottokar II. In the 15th and 16 century, the castle was often given out to the aristocratic families, especially Lords of Švamberka. Unkempt castle was in ruins and the 17th century it was uninhabited ruin. First half of the 12th century maintained a massive tower made of stone, lined with granite blocks.
(Source: http://www.hrad-primda.cz/)