There are so many places to experience in Main Market Square. It is easy to overlook this small, boxlike structure with a simple copper dome in the southeast corner. Its origin dates back to the end of the 10th century. This qualifies as one of Poland’s oldest churches. Constructed first in wood and then stone, it was rebuilt in the early 12th century and again 400 years later. The Church of St. Adalbert is dedicated to Adalbert of Prague. He was a Christian missionary and bishop before being martyred in 997. It is believed he christened the church shortly before his death. Inside is a museum telling the history of Kraków Market.