The article describes selected historical events and architectural structures from the early history of Ostrów Tumski (cathedral island) in Poznań. The author-guide takes the read-er-tourist for a walk on the island, where the reader can travel back in time to learn about historical facts and curiosities related to the time when the place was the cradle of the emerging city and the Polish state. The first stop is the location originally occupied by the palace and chapel complex from the times of Mieszko I, and which is now where we can see St Mary’s Church and the Psalm Singers’ House. The next point of the tour is the Cathedral, with its history, numerous remodellings and a visit to the interior. The reader is taken to the crypt where the relics of the oldest cathedral buildings are located, and also sees the tombs of Poland’s first rulers and the remains of a baptismal font. After coming back to the main nave, the reader can experience the present-day, regothicised cathedral and visit the chancel and some of the chapels with their original furnishings, including the Golden Chapel. At the end of the walk, the author encourages everyone to explore Poznań’s cathedral island on their own and discover its magic.