St. Clement's Church, Oslo

St. Clement's Church in Oslo, Norway, is an archaeological site that offers insight into medieval religious architecture and early Christian burial practices in the region. The stone church, which dates back to around 1100 CE, was a rare example of a double-nave floor plan, featuring a tower and three central pillars supporting the roof. Excavations in the 20th century revealed seven layers of burials beneath the church, including some of the oldest Christian graves in Norway, dated to approximately 980-1030 CE. The church ceased to function after the Protestant Reformation and was likely demolished by 1540 CE. This site not only provides evidence of ecclesiastical architecture but also sheds light on the spread of Christianity in Scandinavia during the late post-classical period.