After Otto the Quade had restored Sichelnstein Castle and used it to attack the farmers of the region, Hermann II of Hesse set up a counter-castle in front of him. This is how Sensenstein Castle came into being in 1372, because the scythe was stronger than the sickle. It was only 4 km from Sichelnstein and was intended to secure the Hessian borders against the enemy Duchy of Brunswick. At some point in the following 300 years, Sensenstein Castle fell into disrepair. In 1677 the castle was demolished and removed by the then owner. Today, the site belongs to the district of Kassel and the State Sports Association of Hesse, which runs a sports training center here.
There is also a giant legend about the castle, which is partly told at Sichelstein Castle and partly at the group of trees of the Niester giants.
From the Sensenstein Castle there is only a rampart. This can be entered through two passages. Otherwise, there are some information boards about trees and the history of the castle throughout the site. A detour is worthwhile, even if the castle as such can no longer be seen.
What is strange is that unauthorized persons are not allowed to enter the premises. It's just stupid that there are many tourist information boards scattered all over the site and a marked hiking trail starts and ends here. So you can safely ignore the signs.
Also worth seeing is the entrance portal to the castle grounds, as well as the elaborately crafted giant metal statue.