St. Hallvard’s Church and Monastery, located on Enerhaugen in Oslo, serves the largest Catholic parish in Norway. Completed in 1966 and designed by architects Kjell Lund and Nils Slaatto, the complex is considered a masterpiece of Norwegian modernism and has received several architectural awards. The building is constructed from exposed brick and concrete and is divided into three sections: the monastery, the parish offices, and the church. From the outside, the structure appears square and fortress-like, but it conceals a circular nave at its center. A unique architectural feature is the church’s ceiling, which curves downwards toward the middle, creating an intimate space where the roof is lowest where it is traditionally highest. Originally run by the Franciscans until 2008, the monastery now provides housing for Catholic priests.