Neublankenheim
The tower's entrance is over halfway up, but it would seem that there was another entrance connected to the main living quarters to the right.
The tower's construction is unique, being flat on one side and rounded for the remainder.  A close examination of the photos demonstrate that the keep is probably a shell, the stairs and platforms long gone since they were probably made of wood.
Left, several close up shots of the construction of the castle.  While some work has been done to protect the structure from crumbling, the stone work is largely authentic from over 500 years ago.  The photos also show the unevenness of the stones used, contrary to the more careful construction techniques in the Roman era.  This would be one indication that the overall wealth of the region was fairly low, and even local lords had only marginal means to build their residences and forts.
The major portion of the castle still extant is really the inner ward, as there is evidence of outlying walls that would have encompassed the outer ward.  These two views are seen from the road below.