Landre Scur (dark cave) is an important cavity of karst origin located on the northern slope of Mount Resettum, among the woods of Lesis. The large portal, 20 meters by 15 meters, is nothing more than the natural entrance to a system of caves that extends for more than 4 km in the depths, the subject of intense speleological explorations since the 1960s. Over the centuries the cave has inspired myths and legends, such as the one that the Landre would like as a link between the valleys of Claut and Andreis, or the accounts of the first explorers who tell of treasures of the church of Claut, hidden to protect them from riots that occurred in the Napoleonic era.
The cave, at an altitude of 1,113 m, can be reached via a circular ring, traced in 2016, which begins near Casera Casavento (trail CAI 962).