The Church of St. Adalbert is one of the oldest stone churches in Poland. The Church was built in the 11th century and named after the martyred missionary Saint Adalbert whose body was bought back for its weight in gold from the pagan Prussia and placed in Gniezno Cathedral by Boleslaus I of Poland. The interior of the church is cramped, relative to its larger exterior. The floor level is situated under the present level of the Square, which reflects the overlaying of the subsequent surfaces of the plaza with pavement originally adjusted to the two already existing churches (St. Wojciech/Adalbert and St. Mary's Basilica). The church was partially reconstructed in the Baroque style between 1611-1618.
According to the Archeological Museum of Kraków, the oldest relics reveal a wooden structure built at the end of the 10th century and followed by an original stone church constructed in the 11th century, as seen in the lower parts of the walls. These walls became a foundation for a new church built around the turn of the 11th and 12th centuries from smaller rectangular stones. Since the level of the plaza, overlaid with new pavement, rose between 2 to 2.6 meters, the walls of the church were raised up in the 17th century and then covered with stucco. The new entrance was built from the west side and the church was topped with the new Baroque dome. The restoration of the church conducted in the 19th century led to the discovery of its Romanesque past.
At present, the walls of the church are unearthed to show their lowest level. On the south side there's a Romanesque portal and corresponding stone step. The crypt of the church has been adapted by the Archeological Museum as a small Museum of the History of the Market Square showing a permanent exhibit of 'The History of the Kraków Market.'References:
The Externsteine (Extern stones) is a distinctive sandstone rock formation located in the Teutoburg Forest, near the town of Horn-Bad Meinberg. The formation is a tor consisting of several tall, narrow columns of rock which rise abruptly from the surrounding wooded hills. Archaeological excavations have yielded some Upper Paleolithic stone tools dating to about 10,700 BC from 9,600 BC.
In a popular tradition going back to an idea proposed to Hermann Hamelmann in 1564, the Externsteine are identified as a sacred site of the pagan Saxons, and the location of the Irminsul (sacral pillar-like object in German paganism) idol reportedly destroyed by Charlemagne; there is however no archaeological evidence that would confirm the site's use during the relevant period.
The stones were used as the site of a hermitage in the Middle Ages, and by at least the high medieval period were the site of a Christian chapel. The Externsteine relief is a medieval depiction of the Descent from the Cross. It remains controversial whether the site was already used for Christian worship in the 8th to early 10th centuries.
The Externsteine gained prominence when Völkisch and nationalistic scholars took an interest in the late 19th and early 20th centuries. This interest peaked under the Nazi regime, when the Externsteine became a focus of nazi propaganda. Today, they remain a popular tourist destination and also continue to attract Neo-Pagans and Neo-Nazis.