Birdbox 3

The concrete pillbox tucked into the Somerset landscape near Taunton is a proper relic of Second World War anxiety. Birdbox 3 - one of hundreds of observation posts scattered across Britain during the 1940s - sits unassuming but oddly compelling, a squat cylindrical structure that once served as a lookout post for enemy aircraft. It's the sort of thing you walk past and think "what on earth is that?", then spend ten minutes reading up on and suddenly you're fascinated.

This one's free to visit and demands nothing from you except the ability to find it and appreciate what it represents. You won't get inside it - these are exterior-only stops - but the walk to reach it is pleasant enough, and there's something oddly moving about standing where wartime observers once kept watch for the Luftwaffe. History enthusiasts will get more from it than casual holiday-makers, to be honest. Families with older kids interested in the Second World War might find it worth a detour, though younger children will likely lose interest after five minutes.

If you're camping at Waterrow Touring Park just 2.5 miles away, or glamping at Middle Stone Farm, the pillbox could slot into a walking route exploring the wider area. It's not a destination in itself - don't plan a day around it - but as part of a afternoon exploring Somerset's wartime heritage, it earns its place. The real appeal is the slightly obscure, off-the-beaten-track element. Not everyone knows these things exist.