Piskey's Hall (Fogou)

The entrance is easy to miss - just a grassy mound with a low stone opening that looks like it might swallow you whole. Piskey's Hall is a fogou, one of Cornwall's most intriguing Iron Age underground passages, sitting near Helston in the heart of the county. You'll need to duck and shuffle through a narrow stone corridor built around 2,000 years ago, with the earth pressing in above your head. The passage slopes downward, cold air hitting your face as you move deeper. It's genuinely atmospheric - not spooky exactly, but properly humbling.

Archaeology enthusiasts will find this worthwhile, though it's quick - perhaps twenty minutes unless you're keen to contemplate the Bronze Age folk who built it. Families with older kids who aren't claustrophobic might enjoy the novelty, but younger children could find the tight space unsettling. The fogou itself is free to access and sits on farmland, so check locally about access before visiting.

It's the sort of place that rewards a morning detour if you're based at one of the nearby glamping sites - Stay Wild is closest at under three miles away. Pair it with a stroll around Helston itself or venture toward the Lizard Peninsula. Don't expect grand monuments or visitor facilities. This is raw, unglamorous archaeology that makes you think about who carved these passages and why. Whether that appeals depends entirely on your tolerance for standing in a damp hole pondering the Iron Age.