This is the ruin of one of the round defensive towers at Tunsberghus castle, located in Norway's oldest town Tønsberg, which was founded by Vikings in 871. The castle was built in the 13th century by King Håkon Håkonsson.
Round towers, also called drum towers, are more resistant to siege technology such as sappers and projectiles than square towers. The round front is more resistant than the straight side of a square tower, just like a supporting arch. This principle was
already understood in antiquity.
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