Grzybowo, located in the center of Gniezno, the cradle of the Polish state, was one of the castles playing an important role in the formation of the Piast state. Although medieval records and documents do not mention the castle, the stronghold has long been known to archaeologists. At the end of the 19th century, a German researcher Wilhelm Schwartz carried out a survey in Grzybów, and in 1937 an amateurish research was conducted by a young history enthusiast, Olgierd Brzeski - then a junior high school student, staying with the Lutomski family, the last owners of Grzybów. This town became more widely known only after 1990, when a resident of Canada, Brzeski, established a foundation at the Poznań Society of the Friends of Sciences, which organized and financed research in Grzybów and systematic archaeological research began there. Currently, the Archaeological Reserve Gród in Grzybów is a branch of the Museum of the First Piasts in Lednica. As part of the development of the area, the ramparts and the interior of the settlement were cleaned of wild vegetation, and a museum pavilion stylized as a historic entrance gate was built on the place of the cultivated field; with a show and teaching room, as well as a library and archaeological laboratories.

Only a small part of the settlement has been studied so far, but it is already known today that it was one of the largest medieval castles, several times larger and slightly older than those recognized as the princely power centers of the Piasts Lednica or Gniezno. Its area was almost 5 hectares, and the area of ​​2.2 hectares was surrounded by a defensive wall 16 meters high and about 27 meters high. To date, there is a 8.5-meter-high shaft in some parts of the settlement (from the partially preserved moat). On the basis of the constructed model of the construction of the castle embankment, it was found that it required around 62 thousand for its construction. m2 of wood and 84 thousand m2 of a mixture of soil, clay and sand. As shown in the studies of wood used to build the embankment, the settlement was created around 930. The oldest ceramic vessels found by archaeologists in Grzybów are dated back to 915. Real emotions engulfed researchers in 1999, when in the stronghold nearly 800 fragments of silver Arab coins were found from the 9th-11th centuries. The found monuments testify to the presence of representatives of the then elite in the city, and thus determine the important position of the city in Grzybów in the oldest structure of power. The castle existed until the mid-eleventh century, later it was abandoned, and its interior until recently was a cultivated field.

It is best to go on a trip to Grzybowo in August - then the Grzybowski War Tournament takes place in Grodzisk. During the events aimed at propagating the traditions and customs of the Old Slavonic, there are medieval craft shows, a tournament of wars, craft demonstrations and historical scenes, as well as a battle to defend the town.

After visiting the settlement, it is also worth to get to know other interesting facts of Grzybów. On the way to Września there is a manor house from the 19th century, rebuilt at the turn of the 19th and 20th centuries for the Lutomski family - the last owners of Grzybów. In front of the court there is a copy of the famous statue of the Slavic god Światowid, found in the Zbrucz River in Podolia, made in the 1930s. In the northern part of the village, by the road to Gulczew, there is a wooden, shingled church of St. Michał Archanioła erected in 1757 from the foundation of the then owner of the village, Stanisław Trąmpczyński. At the church cemetery it is necessary to see the cemetery chapel built in 1936-38 for the Lutomskis' tomb. This chapel in the form of a stone rotunda imitates the early-Roman chapel of St. Felix and Adaukt. Some of the monuments acquired during archaeological excavations, as well as a model of the castle, are displayed at the Września Museum - it is worth visiting during the trip to Grzybów.