The gradually built complex of Castle Rajhenburg was adapted to the morphology of the steep rocky hill and therefore built on a surface in the shape of an irregular polygon. Based on the findings of the latest research, which revealed the location of the entrance into the Romanesque castle, it can be said that the ground plan of the castle was already defined by its original design. Investigations in the vestibule revealed that the entrance was almost in the same place as the entrance with a preserved Renaissance portal is today. The threshold of the Romanesque gate was discovered 2,5 m to the south, inside the vestibule. It was built into the paved walking surface and delimited by two buildings, one on the east and one on the west side. The walking surface of the Romanesque entry and the courtyard was paved with large flagstones bound with mortar. Stratigraphic relations clearly indicate that the pavement was created together with the two flanking edifices built in the Romanesque technique, the small gate tower and a later demolished building to the West. According to the small finds, the original entrance with pavement was in use at least until the late Gothic period. The still existing building east of the vestibule was once interpreted as a small gate tower added in the 17th century. The latest research, however, indicates that it was built in the Romanesque period. Another new discovery is a semicircular portal that led into the northwestern tower (p6) trough its south wall. It was accompanied by a construction of flagstones and mortar, probably a remainder of a low staircase. The location of the Romanesque entrance into the palas was revealed when a test trench was excavated in the narrow passage between the northern palas wall and the Renaissance staircase, which leads to the arcades of the courtyard (p23). There, a semicircular Romanesque portal was discovered in the northern wall of the palas, moved westwards from the axis of the palas. The portal was walled in before the vaulting of the palas – which was probably connected with the rearrangement of floor levels in the entire complex. In the Renaissance period, probably soon after 1600, the castle was thoroughly rebuilt: arcades were built in the courtyard, and floor levels in different parts of the complex were probably rearranged and unified. An extension (p2) was built against the southern wall of the Romanesque tower, east of the gate (p3). The building to the West, between the northwestern tower and the gate, was removed and replaced with a new one (p4-p5). In the newly constructed building west of the vestibule (p4-p5), the foundation of a stone spiral staircase was documented. It was certainly then that a new semicircular rusticated portal with the coat of arms of the Gall- Gallenstein family on the headstone was constructed. While the entrance to the castle is in the axis of the original entrance, the portal was moved nearly 2,5 m to the north, and raised for about 1 m. The gradient of the terrain in the interior courtyard was thus eased. The portal could be raised because the level of the outer castle ward was raised as well, and that was made possible because at the same time a bridge was built across the moat. The castle courtyard was dug up several times in the past; at first due to pavings and rain drainage, later also because of different infrastructural conduits. During the 2011–2012 investigations, we traced these excavations, which were especially dense in the vestibule area. In the western part of the courtyard the rock basis is very high and it slopes down towards the entrance. The consequence is that the majority of drainage channels led into the moat. In the central part, several channels made of stones and bricks were documented. They led into the castle cistern and are associated with the time when the Trappist monks occupied the castle and the well no longer had its function. In the outer ward area – in the moat, northwest from the bridge, foundations of 19th century buildings were documented under thick layers of fills and levelling deposits. On the southwestern side, the position of rock basis and a walking surface from the time of the Trappist monastery were documented. Also two walls, parallel to the moat, were discovered. They were constructed together with the bridge (after 1600, the time of the construction of the entrance portal). They were probably parapet walls, enclosing the relatively deep moat.