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Tourists' favourite rocky area represents the remnants of a sandstone plateau with deep gorges and valleys, where nature created a unique sculpture with tall, significantly extended rock towers. The area is rather small in terms of size, but its rock formations, gorges, ravines, hollows, and locations of prehistoric finds are abundant. It is protected as a nature reserve since 1933. The most interesting parts of the rocks are easily accessible on safe tourist marked paths and many beautiful lookouts provide a complete overview of the Prachov Rocks area.
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Rock castle Kozlov was built on several sandstone blocks at Chlum hill (358 m above sea level) above village Podháj. Only few remnants of the castle survived until present: small rooms carved into the rock, defensive moats and castle well. Mortises for the wooden parts of the castle are well visible in the rocks. The castle used particular natural rock formations as defense walls, which were extended by wooden fortifications. There are many interesting rocky outcrops around the castle area. The lookout of Karel Vaclav Rais is near the castle.
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 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.
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.
Humprecht, designed by Carlo Lurago, was built as a small hunting lodge by Humprecht Černín John the Earl of Chudenice in the years 1667–1672. A banquet hall, library and black kitchen can be visited in basement, the women's and men's rooms with original furnishings and ladies' dressing rooms with a small picture gallery are in upper floor.
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.