Priory House Heritage Centre

The Priory House Heritage Centre sits in Dunstable, a solid little market town that doesn't get the tourist footfall it deserves. What you're looking at is a genuine piece of medieval architecture - the sort of place where you can actually feel the weight of centuries in the stonework rather than just read about it on a plaque. The centre tells the story of the town's religious heritage through the building itself and whatever exhibits they've got on rotation.

It's genuinely worthwhile if you're into local history or medieval architecture. Families with older kids will get something out of it; younger ones might find it a bit dry unless you really sell them on the creepy basement bits and hidden passageways (if there are any - that's the sort of detail that makes these places stick in memory). You won't need more than an hour here, so it works perfectly as a half-day addition to a park-based holiday.

If you're camping at Merlin Farm near Whipsnade, you're only 2 miles away, making this a brilliant cultural palate-cleanser between animal encounters and outdoor time. It's free or extremely cheap - the sort of attraction that doesn't announce itself loudly but rewards curiosity. Dunstable itself is worth a wander afterwards for lunch or an ice cream. Not Instagram gold, but proper interesting if you care about how England actually developed.