At the turn of the 20th century, the school of architecture commonly referred to as the National Romantic style flourished in the Nordic countries. Faced with societies that had changed dramatically with industrialization, architects and others looked back nostalgically towards their cultures' roots in Viking sagas and vernacular architecture. This accounts for the many buildings you will find that were inspired by medieval architecture and adorned with dragons and curving runic decoration in Stockholm (as well as Copenhagen, Helsinki, and Oslo).
One of the most famous examples of the National Romantic style in Stockholm is the Engelbrektskyrkan which presides over the surrounding streets of Östermalm from its hilltop. Designed by architect Lars Israel Wahlman and completed in 1914, the church follows a modified Byzantine style and is adorned with details lifted from traditional Scandinavian architecture. The church is one of the largest in Stockholm and its 105-foot high nave is the tallest in Scandinavia.