Fact is that it closely resembles a Viking ring fortress. The diameter of the restored fortress is 185 m. Between 2001 and 2007 the fortification of Burgh was partially restored.
It's true that this structure bears resemblance to a Viking-era ring fort. Its restored perimeter measures 185 meters in diameter. From 2001 to 2007, work on restoring the fortifications at Burgh took place.