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Chateau Hrubá Skála was built on a sandstone rock on the site of a former medieval castle rock, which was established by Hynek of Wallenstein. The castle was first mentioned as the property of Wallenstein dynasty in the charter of 1353. It was rebuilt into a Renaissance chateau in the mid-16th century and later rebuilt in Neo-Gothic style during the Romantism period. The chateau serves as hotel and offers a variety of restaurants and other representative rooms of the castle.
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The oldest castle in the Bohemian Paradise was built around the 1260. Its residential function ended in late 15th century and the castle was abandoned. Ruined castle raised to a new glory with the efforts of Wallenstein family, who rebuilt it into a remarkable pilgrimage site with a unique genius loci in the 18th century. The new owners of Lex of Aehrenthal made castle available to the public and they finished the romantic adaptations of old residence into famous landmark in the 19th century.
These rocks are on the hill Bor (360 m above sea) 1 km west of the village Rovensko p. Troskami. An elongated hill is bordered with rugged sandstone wall with alcoves, ledges, cavities, and caves. The sandstone rocks of Borek include a number of interesting rock formations, such as blocks, columns, caves and various minor forms of weathering such as honeycombs and ironstones. The upper plateau is covered by pines, whose age is about 120 years. Shallow sandy soils and hard sandstone bedrock caused the vegetation to grow flat tops, slightly stunted.
The hill Trosky (488 m above sea) represents the remnants of volcanic scoria cone. The original volcano, which broke with the explosion through sandstone about 17.5 million years ago, was worn down by erosion over time. Only two highly resistant basaltic towers remained exposed, which are the remnants of conduit that once filled the vents inside the scoria and ash cones. The thicker one is called Baba and thinner is called Panna. The famous ruins are the remains of castle built here in 14th century.
Nature Reserve Apolena is near Castle Trosky east of the village Troskovice. Rock towers were separated by erosion after fracturing of the sandstone basin. The eruption of the nearby volcano 17 million years ago, and also falling of individual blocks of rock on the hillside of Libuň furrow influenced it. Rock massive and standalone rock towers from the softer sandstone are a good habitat for rock nesting birds such as kestrel, eagle owl, and Jackdaw. Cleftcave Sklepy, the largest in the PLA Bohemian Paradise, which is the home for eleven species of bats, is hidden among the rocks.
The remains of a gothic castle lies in the Nature reserve Klokočské rock, which was established in 1985 on an area of 228.13 hectares. The sandstones form about 2 km long rock wall with several standalone rock pinnacles above village Klokočí. Rotštejn was founded by Markvarts family in 14th century, and it was abandoned in the early 16th century.
Rock area Klokočí consist of an asymmetrical ridge of Late Cretaceous sandstone blocks about 1600 m long, with a large number of variously sized cavities. The vegetation includes pine forest with fragments of beech. The largest sandstone cave of Bohemian Paradise called Postojna is located here, in which the traces of the oldest settlements in the area were found. Rocky outcrops of Klokočí offer many attractive lookouts with magnificent panoramic views of the northern and south-eastern part of the Bohemian Paradise including Kozákov hill. The ruins of the castle Rotštejn lies towards the southern edge of Klokočské rocks.