Cuknštejn Fortress, Renaissance fortress in Údolí, Czech Republic

Cuknštejn Fortress is a four-winged late Gothic structure of roughly rectangular plan, built between 1488 and 1491 by Vilém Pouzar of Michnice. One-storey wings of different ages enclose a small square courtyard, three sides of which carry a stone gallery reached by two symmetrical staircases. A two-storey south wing with a Gothic portal holds the gate passage, and an octagonal tower rises at the northwest corner.

Vilém Pouzar of Michnice built the late Gothic fortress between 1488 and 1491; his uncle Oldřich inherited it in 1496 and died in 1549. Construction continued until 1568, adding the south wing with its gate, the north wing and the northwest tower. Imperial troops burned it during the Bohemian revolt, and after 1620 the Buquoy family held it for over three centuries.

The name Cuknštejn, German Zuckenstein, gave its name to a small village that stood nearby at the end of the 15th century; it was recorded as deserted in 1654, having vanished during the Thirty Years' War. Since 2000 the fortress has been privately restored and, by prior arrangement, opened to visitors; it also serves for weddings and film shoots, including the 2000 fairy tale Královský slib and the 2008 film Ať žijí rytíři!.

The site is reachable via marked hiking trails, including the South Trail of Via Czechia, which connects several historical locations. Visitors should wear sturdy footwear and prepare for terrain conditions that vary by season.

The fortification offers far-reaching views across the valley from multiple elevated positions that once served for surveillance purposes. These vantage points help visitors today understand why the location was chosen strategically for defense.