The 18 months of uninterrupted excavations, conducted around the collegiate church in Wiślica, were related to the project to create an underground space for a new museum. The fact of operating in the area of a multi-phase cemetery, where some of the graves were located at a depth of 4 meters, meant that an innovative method of recording the discoveries made was developed for the task. It was based on repeated laser scanning, supplemented by a process of serial photogrammetric documentation. In total, nearly 2000 sqm of the site were surveyed, exploring layers to depths of up to 5 meters. Over a vast area, the top of the natural layers was discovered, along with traces of the oldest Neolithic settlement. Above that, the presence of a sequence of layers of the early medieval settlement was recorded, dating from the oldest phase to the 9th century (around St. Nicholas Church). Due to climatic changes in the twelfth and thirteenth centuries, including a sharp increase in the risk of flooding, the stratigraphy of the area around “Wiślicka Island” is incomplete. For this reason, the analysis of elements of the site’s topography provided the researchers with key arguments, the basic element of which were deep, linear ditches. The older one was made intentionally and probably constituted the eastern boundary of the compact agglomeration, located at the top of the uplift, which was owned by the duke. The second event recorded in the topography of early medieval Wiślica are two ditches discovered on two sides of today’s Gothic collegiate church. They are traces of a devastating flood that had the effect of washing away the foundations and destroying the oldest collegiate church – one commonly known from the presence of a plasterboard with figural engra vings. Among the archaeological sources there are no clear chronological indications that could determine the time of this cataclysm. It is tentatively assumed that it was a flood mentioned by a Polish chronicler for the middle of the 13th century. The youngest element of the site’s stratigraphy was an extensive cemetery located around the collegiate church. It contained a space for graves related to the functioning of three stone churches: the oldest collegiate church, functioning for just over a hundred years, another Romanesque church, whose duration of functioning was equally short, and finally the Gothic collegiate church, whose beauty we can still admire today. The materials coming from the excavations are in the preliminary stages of scientific analysis.