In February 2022, Graeme Cavers and his team of archaeologists set off in search of a mysterious underground passage called a souterrain. There are around 500 of these Iron Age structures scattered throughout the Scottish Highlands, but nobody knows what they were built for, and no one has ever discovered one intact.
“Perhaps they were for storage, such as grain in sealed pots or dairy products like cheese,” says Matt Ritchie, resident archaeologist at Forestry and Land Scotland. “Perhaps they were for security, keeping valuables safe, or slaves or hostages secure. Or perhaps they were for ceremonial purposes, for household rituals, like a medieval shrine or private chapel.”
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