From the ruins of the castle from the 13th century is not much to see, but the foundations of a tower of the Wehrmacht. You can decipher "Built in 1938 by the 2nd ma Kp.P 49" de.m.wikipedia.org/wiki/Nellenburg_(Neustadt)
Small MTB single trail: best to drive from the opposite side of the road. Go both ways, but make more fun from Wasenberger Straße. 30-40 meters of roots, few stones, waves and densely overgrown in summer. Thumbs up! 👍🏻