Citadel on the top of the hill, 1,5h walk through the forrest, thorns and mud, and rain at the end, haha - a fall.
End of 15th century, not much historical data, preserved so-so, tower maybe 15m high, walls in circle about 25m in diameter and ~4-7m high. Moat for defense around the citadel still can be seen, oak and beech-trees around, etc.
Nice hiking, but tiredness is a mild word...