

Paradox Museum Barcelona features over 70 interactive exhibits showcasing optical illusions and visual paradoxes. On Sundays in May and June, children get in free and can join free paradoxical workshops from 11:00 to 13:45, where kids create their own optical illusions. Adults pay the regular admission price. The museum is one of more than a dozen Paradox Museum locations worldwide, combining hands-on activities with interactive displays designed for all ages.
More family picks, Friday to Sunday.

Festival
Festa Major de Sants 2026
Daily Aug 22-30 · Free

Festival
Gràcia's Last Night: Kids' Fire Run
Fri Aug 21 · Free

Outdoors
A 700-Year-Old Monastery Opens Free on Summer Evenings
Through Sep 8 · Free

Workshop
Your Family Gets Its Own Science Mystery at the Museu Blau
Through Sep 3 · Free

Festival
Festa Major de Gràcia 2026
Through Aug 21 · Free