Lion Salt Works
The last open-pan salt works in Britain, kept exactly as the salt men left it, with interactive galleries that explain why Cheshire is full of holes. Genuinely interesting, and next to Marbury for a run afterwards.
Museums & science in Northwich
Hands-on museums and science centres. Several of the best ones are free.
Museums & science in Northwich
Museums & science elsewhere in the North West
World of Glass
Free, indoors and better than it sounds: interactive science aimed at younger children, glassblowing demos, a picnic area and a small playground outside.
World Museum, Liverpool
Five floors, free, and it covers three things small children reliably love: giant dinosaurs, an aquarium and a space gallery. The best wet-weather day within half an hour.
Catalyst Science Centre
Hands-on science galleries and a glass rooftop observatory over the Mersey. Small, cheap, indoors and close.
Science and Industry Museum
Working steam engines, the story of Cottonopolis, and hands-on galleries in the world's oldest surviving passenger railway station. Free, and the live demonstrations are the bit kids actually remember.
Manchester Museum
A T. rex skeleton cast, live frogs in the vivarium, Egyptian mummies and a genuinely good natural history floor. Free, university-run, and less overwhelming than the big London equivalents.
National Football Museum
Shirts, trophies and match footage across six floors, with penalty shootout and skills games that football-mad kids refuse to leave. If yours do not care about football, skip it - it is exactly what it says.