Wenlock

Much Edge Lane in Beaconsfield holds the remains of Wenlock Priory, though calling it a priory might be generous these days. What you're actually looking at is a modest historic site - a few crumbling stone fragments and earthworks that tell the story of a medieval religious community that thrived here centuries ago. The setting is quiet, almost forgotten, which is part of its appeal if you're after something off the well-trodden tourist circuit.

History enthusiasts will find it worth a brief stop, particularly if you're interested in how monastic life shaped the English landscape. The site itself doesn't require hours - a good twenty minutes gets you round it - but the surrounding countryside is proper lovely for a walk. Beaconsfield, just down the road, gives you proper infrastructure if you need refreshments or a town visit.

If you're camping locally at Penn Meadow Farm or Highclere, it's a reasonable outing rather than a destination in itself. The nearby Chiltern Hills offer far better walking if that's what you're after, and Beaconsfield itself has more obvious attractions. That said, if you're keen on monasteries and you're in the area anyway, you'll find it peaceful and genuine - no gift shop, no crowds, just the bones of history. Best in good weather when the grounds are walkable. Free admission seems likely given the modest nature of the site, though you'd want to check locally before making a special trip.