The curtain wall, part of the shield wall, the 18-metre-high keep on a base of 6.75 by 6.75 meters with its high entrance at a height of four meters, the remains of buildings on the east side and two cannon towers are well preserved. The size of the core castle was around 90 by 30 meters. The rectangular keep dates from the 14th century with its round turret from the 15th century.
The castle ruins were immortalized in literature by the poet Stefan George (1868-1933) in his last volume of poetry Das Neue Reich (1928) with the poem Burg Falkenstein: “Zur bewaldeten kuppe / stieg ich an neben dir / Wo auf rauh-gradem eckturm / sich der rundturm erhebt”. “To the wooded hilltop / I climbed next to you / Where the round tower rises on a rough-grey corner tower”.