The previously unknown Sanctuary of the Flags was uncovered and made accessible only in the years 1981 and 1988. It was then that the foundation of a large round apse was found outside the church, which had completed the construction towards the south. A basilica had preceded it in the north.

Next to the largely intact sanctuary there is a room with archaeological traces from the 1^st  century onwards. In the 4^th century the civilian population settling in the fort area had installed cooking places and a duct of warm-air heating.

In the course of the excavations led in 1981 walls of a Carolingian hall church were found, which had been erected on the Roman foundation by Bavarian colonists in the 9^th century. It belongs to the most ancient church buildings in Lower Austria.

Along the Austrian Danube Limes only two sanctuaries of the flags have survived: one under the parish church of Zeiselmauer, the other one under the church of Traismauer. In both cases the village names refer to their Roman origins (the ending “-mauer” meaning “wall” in English).