16th century defenses discovered at Stirling Castle

Renovation work for the gift shop at Scotland's historic Stirling Castle has unearthed the castle's 16th century defenses, which were built using the latest techniques around 1540. The defences were demolished during modernization in the 18th century.

Peter Yeoman, from Historic Scotland, said about the defenses,  "They are of great interest because they were early examples of a changing approach to military engineering, and among the most advanced in the whole of the British isles."