Leah Viaduct

The viaduct itself is the star turn here - a proper Victorian engineering feat that carries you across the landscape with the kind of confident sweep you don't see much anymore. Walking underneath or across it gives you real pause. The museum side of things tells the story of how this thing came to be, which matters more than you'd think when you're standing beneath arches built in the 1870s without the faintest idea of modern engineering safety nets.

It's the sort of place that will absolutely grip railway enthusiasts and anyone who gets a bit misty-eyed about industrial heritage. Kids can find it interesting enough if you're the type to explain how loads work and why the Victorians were basically showing off. But honestly, if you're after a full afternoon's entertainment, you might be disappointed. The viaduct is the thing, and you can appreciate it in well under an hour.

The museum angle gives context - learn about the engineering, the navvies who built it, the impact on transport through the Midlands. Whether that's your cup of tea depends entirely on how much you care about such things. Northampton's close by, so you could pair this with a town day if needed.

With several parks within 4-5 miles - Billing Aquadrome and Riverview Park aren't far - it works as a morning detour during a caravan holiday in the area. Free to admire the structure itself, though do check ahead about museum access and any charges.