The remains of the fortress lie in the area of Old Calenberg (Alt Calenberg), which has been part of the Calenberg-Leine Valley Protected Landscape (Landschaftsschutzgebiet Calenberger Leinetal) since 1997. Of the fortress and the motte, only the ramparts, cellars and foundations of the fort, the manor house, the Corvinus Cellar and ruins of the battery tower remain. The battery tower and its 2 cellars have been locked since the middle of 2008. Bats hibernate in the vaulted cellars under the two wings of the castle. From 1 October to 30 April the hibernating animals must not be disturbed. In one vault there is a stone well, several metres deep. The underground cellars are so extensive that, on one occasion, two children that had strayed into them had to be rescued by the emergency services.