The ruin Urnburg, also called Dalenburg, is the ruin of a hilltop castle on a wooded hill on the county road K 4711 between Rohrdorf and the L 370 south of the district Rohrdorf of Eutingen in Gäu in the district Freudenstadt in Baden-Württemberg, Germany. The Urnburg was once one of the important castles between Horb am Neckar and the Neckarknie. For a long time it was the ancestral stronghold of a branch of the Lords of Weitingen. In 1381 Count Rudolf III sold. von Hohenberg possession of Duke Leopold III. from Austria. However, due to unreleased pawns, the wife of Rudolf III, Ida of Toggenburg, retained the rule. The castle served her temporarily as a widow's seat. It was not until 1392 that Duke Leopold IV of Austria was able to exercise his right of release. Of the Austrian owners the rule Urnburg was pawned several times. , Schwarzwälder Bote, March 20, 2011 At the end of the 14th century, the Urnburg fell into the turmoil of the city war and was besieged in vain by the Margrave Bernhard von Baden. After some back and forth, the rule came into the possession of the Duke of Württemberg Eberhard Bart, after he had previously destroyed in a lawsuit in 1465 the castle itself by shelling to the uninhabitable. With financial support from King Maximilian I, the castle was rebuilt. When it came to a rift with Duke Ulrich of Württemberg, this let the Urnburg plunder and burn down. Since then, the Urnburg served for a time as a granary and in 1576 the ruins with the associated villages came under Austrian rule, which eventually put Napoleon Bonaparte in the Peace of Bratislava 1805 an end. Since then, the castle ruins have provided the Rohrdorfer farmers with the building material for their farms and were demolished. From the former castle only a thoughtful round tower is preserved.