Dürnstein Castle, perched at 312 meters on a rocky hilltop overlooking the Danube River in Austria's Wachau region, stands as one of the most iconic medieval ruins in Lower Austria. Built in the mid-12th century by Hadmar I of Kuenring, the castle gained international fame through its connection to English King Richard the Lionheart, who was imprisoned here in 1192 by Duke Leopold V after his capture near Vienna. According to legend, Richard's devoted minstrel Blondel discovered his location by singing a recognizable tune outside castle walls until Richard responded. After suffering destruction during the Thirty Years' War when Swedish troops conquered it in 1645, the castle remains partially ruined today. Freely accessible year-round, visitors can hike approximately 20-30 minutes from the town center to explore the ruins and enjoy spectacular views of the surrounding Wachau Valley.