Next to the semi-circular apse of the Aula regia (throne hall), an archaeological protective structure was built in the year 2000. The walkable steel-glass construction conserves the extraordinarily well-preserved remains of a Staufer heating system from the 12th century. Due to its shape, size, and condition, it is a unique testimony to the history of high medieval technology.
Detailed information about this heating system is provided on information panels at and within the protective structure. The key to the protective structure can be borrowed at the visitor center and at the museum at the Kaiserpfalz.
During archaeological excavations in 1993 and 1997, two graves from the 9th or early 10th century were also found in front of the apse of the Aula regia. Further information on this can be found on a panel in the lowered area that corresponds to the historical ground level. At this point in the tour, there is also the opportunity to ascend almost ten meters high to the fortification wall from the 12th century via a spiral staircase, which provides an overview of the archaeological zone of Kaiserpfalz Ingelheim. Through the battlements, one can see to the west
the St. Remigius Church and to the north the Rheingau.
