Casterley Camp

You'll find yourself walking across open downland near Marlborough, where a series of concentric earthwork rings mark out what was once an Iron Age fort of considerable importance. Casterley Camp isn't dramatic in the way hillforts sometimes are - there's no towering rampart or obvious defensive structure that makes your breath catch. Instead, it's the sheer scale of the thing that gets you: those ditches and banks spreading across the landscape tell a story of serious fortification and settlement dating back around 2,500 years.

The site works best for anyone who enjoys piecing together history from the land itself. Archaeologists will find it genuinely interesting; casual visitors might spend twenty minutes wandering the perimeter before moving on. There's no visitor centre, no interpretation boards to speak of, just you and the earthworks and whatever imagination you bring to it. The walk is straightforward enough, though the ground can be muddy depending on recent weather.

If you're based at Little Owls Camping or Hillview Park nearby, it's worth the detour on a decent afternoon. Pair it with a walk across the Downs proper - the landscape around Marlborough is cracking for that sort of thing. Don't expect queues or facilities. Bring sturdy shoes, give yourself an hour including the walk around the perimeter, and go when the ground's dry if you can manage it. Free access, naturally, since it's just open downland.