Zlenice-Hláska

Zlenice, popularly known as Hláska, is a medieval castle ruin perched above a bend of the Sázava River, right at the confluence with the Mnichovka stream, on the southern edge of Senohraby in the Prague-East district. Its distinctive tower, visible from far along the valley, has long drawn hikers walking the trails beside the Sázava as well as visitors interested in the history of central Bohemia.

Where does the name come from and who lived here?

The first written mention of Zlenice dates to 1318, when the records name Oldřich ze Zlenic. The castle's name comes from the vanished settlement of Zlenice, which once stood on the opposite bank of the Sázava and later disappeared. The castle itself was most likely built at the beginning of the 14th century as the seat of a noble family controlling the surrounding land and the river crossing.

What happened to the castle?

The stronghold did not survive the turbulent Hussite and post-Hussite era - it was conquered and destroyed in 1465. Since then Zlenice has remained a ruin, of which mainly a single distinctive tower has survived, known locally as Hláska ("watchtower"). It is this tower, dominating the surrounding landscape, that gave the site its popular name.

Why visit today?

The ruin sits on a promontory above the Sázava valley, roughly 4 km along the red-marked trail from either Hvězdonice or Čtyřkoly train station, making it a popular destination for hikers and cyclists who often combine the visit with time on the river - this stretch of the Sázava has long been a traditional hub for canoeing and riverside camping in Bohemia. A wooden bridge now spans the old moat leading to the ruins; it was recognized in 2014 as one of the year's best carpentry achievements. From the walls, visitors get a romantic view over the river bend and surrounding forests, especially striking at sunset.

What is the cultural significance of this place?

The picturesque ruins of Zlenice have long inspired Czech artists. The castle captivated the poet Karel Hynek Mácha, one of the leading figures of Czech Romanticism, as well as painters Karel Liebscher and Josef Lada - the latter repeatedly featured Hláska in his paintings, which is why the tower's silhouette is recognizable across the country, far beyond the Sázava region itself.

Frequently asked questions

How do you get to Zlenice (Hláska)? The easiest way is on foot or by bike along the red-marked trail beside the Sázava, starting from Hvězdonice or Čtyřkoly train station - the distance is about 4 km.

Can the ruins be visited independently and at any time? Yes, the ruin site is freely accessible and can be visited at any time, without an entrance fee or a guide.

What exactly has survived from the castle? The main surviving element is the tower known as Hláska - which gave the whole ruin its popular name - along with fragments of the defensive walls and the moat, now crossed by a new wooden bridge.

Why did the castle fall into ruin? Zlenice was conquered and destroyed in 1465, during the post-Hussite conflicts, and was never rebuilt afterward.

What else is worth seeing nearby? This stretch of the Sázava valley is a popular area for canoeing and riverside recreation - a visit to the ruins pairs well with a canoe trip or a walk along the river.