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Kozlov (hrad, okres Semily) Castle ruin

Kozlov (hrad, okres Semily)
zřícenina hradu Cultural monument ruina No barrier-free access Dogs welcome Bikes welcome Updated 25.09.2026
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About the monument Then and now Milestones Architectural development Events Points of interest Guide Tips Events nearby Nearby Accommodation Route Seasons Gallery Sources Map Stories Reviews

Kozlov is a ruin of the Gothic castle from the first half of the fourteenth century, situated southeast of Košov, near Lomnice nad Popelkou, in Semily district. The monument stands on the same-name hill with melafyre origins in Jegrovsko, the Czech Republic, and since 1964 it has been protected as a cultural monument.

We know little of the castle's oldest history. Based on the ceramics found it was built in the first half of the fourteenth century. The only credible reference dates back to 1462, when it is described in the description of the quarry estate only as a castle, which suggests it was already abandoned. The USDA of 1667 only mentions a piece of an ancient wall. Bohuslav Balbino's report on the conquest of the castle in 1442, when it was to serve the robbers, is not considered true.

Typologically, Kozlov belongs to castles with a mantle wall approximately two metres wide. The main wall was built from the inside of the building from a weaker masonry, of which only terrain signs remained today. The castle was one piece. The wall and moat surround it except the southeast side. Neither the prepayment nor the economic background was found. The access path probably led from the north to the east side of the hill.

Below the castle core is a narrow underground corridor (approx. 80 cm wide, 130- 170 cm high) approximately ten metres long, slightly sloping and ending with a steep, eleven metres deep artificially carved chimney with overflowing bottom. The historians approach it differently: Tomáš Durdík connects it to water supply, Zdeněk Fishera sees it as an escape route to the southeast side.

The castle and the city of Lomnice nad Popelkou are associated with the reputation of a Tartar scout who, after the raids were reflected, was trapped in ruins on top of Kozlov and ambushed buyers. The locals tricked him into covering the pits and the royal guard took him to Prague. For this deed, King Václav I. promoted Lomnica to the city and gave her a sign with a Tartar warrior in arms standing in praise.

Today, fragments of the perimeter wall and terrain relics of fortifications are preserved from the castle. To the ruin leads a green marked tourist route from Košov towards Peklovsi; The nearest railway stop is Cidlin on the track Mladá Boleslav - Stará Paka.

Kozlov is an interesting example of early fortifications in this area. Visiting this silent witness history allows you to explore the remains of medieval architecture in the natural environment.

Where to next

Hrádka 1,5 km Alainova věž 2 km kostel Proměnění Páně (Chlum) 2 km Kláštenec 2,1 km

Then and now

Drag the slider to compare how the landmark may have looked when it was built with the view today.

Today's view – Kozlov (hrad, okres Semily)
Historical appearance – Kozlov (hrad, okres Semily)
Then Now

The historical appearance on the left is an AI-generated visualisation and serves as inspiration only.

Historical milestones

1462
The first credible mention of Kozlov Castle in the description of the quarry estate.
1667
A reference to the remnants of an ancient wall in the Urbary of Lomnics.
1964
The building is protected as a cultural monument.

Architectural development

The castle is typologically one of the castles with a mantle wall approximately two metres wide. Building from a weaker wall was added to the main wall from the inside. Under the castle core is a narrow underground corridor ending in a steep, eleven meters deep chimney.

Historical events

In 1462, the first credible mention of the castle appeared. In 1667, an ancient wall is mentioned in the urbarium. Since 1964, the building has been protected as a cultural monument.

Points of interest

- The castle is a Gothic ruin from the first half of the fourteenth century, which stands on top with melaphyr origins. - It belongs to castles with mantle walls approximately two metres wide. - Under the castle core is a narrow underground corridor ending 11 meters deep artificially carved chimney. - The historians disagree on the purpose of the corridor, whether it was used to supply water or as an escape route. The castle is associated with a reputation of a Tartar scout, which led King Václav I. to promote Lomnica to the city and give her a sign.

Guide

Show guide text

⚙︎ This text was created by artificial intelligence and has not been editorially reviewed. It may contain inaccuracies.

Welcome to the top, where history meets the untamed force of nature. You are standing in a place that used to serve as a mighty fortress, but today it is only a silent witness of ancient times. The ruins of Kozlov Castle stand before you. But before you begin to view yourself, let your eyes first adopt this unique landscape. Look around you at these dark, rough and unusual rock origins. What you see is a melaphyr. This rock forms the very basis on which the castle was built, and its hardness and imformity also determined the very nature of the building. You are in the heart of the Yegvoda-Kozakov ridge, a place where wind currents break against rock walls and where every rock tells its own story. Feel this atmosphere, this sense of openness and the isolation this place offers.

Now let's move forward in time and understand why someone would decide to build a castle right here on these inhospitable rocks. Kozlov is not just a random pile of stone. Its roots go deep into the first half of the 14th century. At that time, it was necessary to build fixed points in the landscape that would control the surrounding areas and provide security. The castle was built in a Gothic style, which you can tell by its robustness and the way it tried to blend in with natural terrain. Although the castle became part of important property units, his life's journey was surprisingly short. In the second half of the 15th century, the castle was considered desolate. This means that his era as a inhabited and strategic centre was relatively short, but left a trail that remains to this day. The first credible mention of this castle appears only in 1462, when it was mentioned in the description of the quarry estate. Even though the castle as a whole died, the memory of it remained alive. Even in 1667, a reference to the remains of an ancient wall appeared in the documents of the quarry estate, which proves to us that hundreds of years after leaving, these stones were still seen as an important element of the landscape.

Now pay attention to what's right in front of your eyes. Even if you only see fragments, they're fragments of incredible quality. Notice these remnants of the perimeter wall. If you approach them, you can see details that suggest a huge effort by the builders back then. One of the most prominent architectural elements you can see here is the so-called mantle wall. It's not just an ordinary barrier. This structure is incredibly massive, its width is about two meters. Imagine the work that people had to do in the 14th century to build this wall thickness right on these melaphyr rock outputs. This wall was not just a protection, it was an integration of architecture into the very essence of the rock. See how these stoneware remains connect to natural outputs. That is the gothic genius - to use what nature offers you and to strengthen it with human handiwork.

When you look at these ruins, you can ask who was here and what fate was associated with this place. Although the names of the particular architects who invented and built these walls remain veiled by the silence of history, in times when these areas were formed and the centres of power were established, figures like Václav I. moved within Czech history. Although it is not directly written down how closely Kozlov Castle was connected to its reign, this whole territory was part of the wider political and social development that the monarchs at the time influenced. The castle was part of the quarry estate, which means it was part of a complex network of ownership and power relations that defined life in this part of the country for centuries.

But now I want to invite you to something that you can't see at first sight, something that requires imagination and perhaps even a little courage. Under the castle core itself, where there are now only terrain relics and fragments of the wall, there is a secret. Historical surveys suggest that there is a narrow underground corridor below the castle. This corridor is not just an ordinary tunnel. It's a path to darkness that ends in something that sounds almost otherworldly - an artificially carved chimney that bends down to a depth of eleven meters. Imagine the darkness, the anxiety, and at the same time the incredible technical skill of people who were able to drill such a deep vertical hole in a hard rock. Why was he there? Did he serve as an escape route, as a storage shaft, or perhaps part of some more complex defense system? This question remains unresolved between the rock outputs and gives the place a hint of the mysticism you feel here.

Today Kozlov has been protected as a cultural monument since 1964. This protection allows us to perceive these remains not as a pile of waste, but as a precious piece of human history. Even though there are no tall towers that stand up to heaven, or rich paintings or statues that amaze you with their beauty, Kozlov offers something else. It offers you the opportunity to meet pure history, the essence of what it means to be a fortress. It's a place where you can feel the weight of time and where every rock and every rest of the wall has its meaning.

Don't waste your time and keep walking. Look at the remaining relics of the fortifications, see how the terrain changes and how architecture tried to take over this wild landscape. Let yourself be consumed by the silence of this place and enjoy the views offered by this peak. Thank you for joining us on this short journey through time. We wish you a pleasant further discovery of these historical secrets.

Tips for visitors

Best time to visit Kozlov is in spring and autumn months when the weather is usually pleasant and the level of traffic is lower. These periods also offer the most beautiful views of the surrounding countryside.

Parking for visitors to Kozlov is possible in nearby municipalities such as Košov and Lomnice nad Popelkou. For those travelling by public transport, bus connections are available; precise time information can be found using an online search engine.

When visiting Kozlov, it is advisable to take with you shoes suitable for walking on stone paths and not forget protective clothing because conditions may sometimes be unfavourable depending on the weather. Also remember to bring drinking water and sun protection.

For shooting Kozlov are the best places on top of the ruins where you can enjoy panoramic views. The most beautiful lighting conditions offer morning and evening hours, when the sun illuminates the ruins in fine light.

In the vicinity of Kozlov you can visit the village of Košov or the city of Lomnice nad Popelkou. These sites offer various cultural and recreational activities that are suitable for the whole family.

Businesses nearby

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Events nearby

Krátká cesta dějinami
26. 9. 2026
Krátká cesta dějinami
🏰 Prohlídka 7,7 km
Večerní komentované kostýmované prohlídky hradu Trosky s družiníkem Bergowů, Pepanem, který vám bude vyprávět, jak se v jeho dobách na Troskách žilo, jedlo a pracovalo. Seznámí Vás s historií Trosek od jejich založení až po současnost. Ptáte se kdo a proč pojmenoval svůj hrad Trosky?
Trosky, Tachov

Zdroj akcí: otevřená data měst a obcí ČR (Národní katalog otevřených dat) a kalendář akcí Národního památkového ústavu.

Nearby

The town of Košov and the city of Lomnice nad Popelkou.

Accommodation nearby

Planning a visit? Find accommodation within 30 km of Kozlov (hrad, okres Semily).

Search accommodation on Booking.com Accommodation tips →

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Themed route

Lomnice nad Popelkou Type: City Why to visit: Serves as an ideal starting point for the whole trip.

Koshov Type: Village Why to visit: This location offers a peaceful introduction to the road.

It is a generous Cossack's back Type: Cattle Why to visit: Provides beautiful views and space for walks.

Kozlov Type: Castle ruin Why to visit: The main destination of the trip where you can explore historical ruins.

Seasonal recommendations

Spring: Kozlov offers a unique atmosphere in spring, when the ruins of the castle turn into a living flower paradise. Sunbeams illuminate roofs and valleys, creating noble light effects that emphasize historical architecture. Nature awakens around the castle with flowering paths and green meadows, creating an ideal environment for relaxing and visiting in a quiet environment. It is recommended to visit the castle sooner or later on the day to avoid high school students on school trips. Good partners are light clothes and shoes suitable for walking on uneven terrain.

Summer: During the summer period Kozlov offers unforgettable experiences with bright days that allow long walks and observation of the castle in light. Discover the natural beauty of the surrounding forest and streams where you can enjoy the cool radiation of the trees. The main summer season brings the largest crowd of visitors, so it is advisable to visit the castle early in the afternoon or on Sunday when smaller groups can gather. A good tip is to bring protective sunglasses and plenty of drinking.

Autumn: In autumn days Kozlov offers a romantic atmosphere when the ruins of the castle turn into colored marble trees. The sunny days and mild temperatures are ideal for a peaceful tour. Visit the castle during the third quarter, when the climb on the outside is the quietest and you can enjoy the beautiful sunsets over the horizon. A good escort is warm clothes and shoes suitable for a cooler climate.

Winter: In winter months Kozlov offers a unique atmosphere where the castle turns into a snow kingdom. Beautiful light effects and calm contribute to the feeling of distance and mystery. Due to the shorter opening time, it is advisable to visit the castle in the early afternoon to enjoy the sunshine in the snow. Good escorts are warm clothes and protective shoes that protect against freezing climate.

Visualizations and artistic views

Kozlov (hrad, okres Semily) – historická rekonstrukce
Historical reconstruction
Kozlov (hrad, okres Semily) – letecký pohled
Aerial view

The visualisations are generated by artificial intelligence and serve as inspiration.

Tips from visitors

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Sources and literature

Fotografie: Ben Skála / CC BY-SA 3.0 — Wikimedia Commons. The author and licence also appear when you hover over the image.

Faktickým podkladem tohoto textu byl článek na Wikipedii, jehož autory jsou přispěvatelé Wikipedie. Článek je dostupný pod licencí CC BY-SA 4.0.

Monument information

Municipality Lomnice nad Popelkou
Type Castle ruin
Style / Period gotický
Protection Cultural monument
Condition ruina
Notable figures
Accessible No
Parking None
Dogs Allowed

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Příběh: Kozlov (hrad, okres Semily)
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Příběh: Kozlov (hrad, okres Semily)

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