CosmoCaixa Science MuseumA science museum with a recreated Amazon rainforest inside the building, a planetarium, a geological wall and hands-on experiments for all ages. Free under 16.
Museu Blau (Natural History)Barcelona's natural history museum at the Fòrum, with life-sized dinosaur skeletons, a free 'Science Nest' for under-6s and a rooftop garden. Free on the first Sunday of each month and every Sunday after 15:00. Free under 16.
Museu d'Història de CatalunyaAn interactive history museum in the Palau de Mar on the waterfront, where children get a free self-guided booklet with games for ages 6-8 and 9-12. Free under 16.
Poble EspanyolAn open-air architectural museum recreating Spain's regional styles in one walled village, with craft workshops, street performers and a playground. Free under 4. Scavenger hunt for 6+.