The Strange Medieval Sculptures of Nidaros Cathedral - Medievalists.net
Briefly

The first stones for Nidaros Cathedral were laid in the late 1100s over St. Olav's shrine, who is credited with bringing Christianity to Norway.
The Octagon, an unusual eight-sided structure within Nidaros Cathedral, has no parallel in Northern European gothic architecture, highlighting its uniqueness.
Read at Medievalists.net
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