The Ulvila Church, dedicated to St. Olaf, is one of the most significant medieval buildings in Finland. The first church was built probably in 13th century to Liikistö, which was a local trade centre. According old documents the graveyard around the church was consecrated in 1347 and church was burnt badly in 1429. Historians believe that the present stone church was built after that between 1495-1510.
There are several medieval and newer artefacts inside the church, for example crucifix and statue of St. Olaf from the 1430s and communion cup from the end of Middle Ages.
The Church has been renovated several times. During the latest renovation in 2005 archaeologists found the biggest medieval coin treasure in Finland. It was buried near the sacristy stone wall in 1390s and included 1476 silver coins.
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.