Gniezno Cathedral, also known as the Cathedral of the Assumption of the Blessed Virgin Mary, is a historic church located in Gniezno, Poland. It is one of the oldest cathedrals in the country, with its origins dating back to the 10th century. The cathedral is an important symbol of Polish Christianity and served as the first archbishopric in Poland. The cathedral features a mix of architectural styles, including Romanesque and Gothic elements. Notable for its impressive bronze doors, the cathedral houses the tomb of St. Adalbert, a key figure in the Christianization of Poland. Today, it remains a significant pilgrimage site and a popular tourist attraction.