Museu Maritim is without doubt one of the more specialist museums and covers the interval 1750 to 1850. It features many forms of maritime artefacts from Barcelona and also the surrounding districts. CosmoCaixa is actually a museum built especially for young children, focused on all the things linked to science. https://www.triptales.me/discover-the-artistic-and-historical-marvels-of-barcelonas-museums/