Yes, the Picasso Museum in Barcelona offers several "free admission" windows, including Sundays, though careful planning is required in 2026. The museum is typically free on the first Sunday of every month for the entire day. Additionally, there is "free-entry" every Thursday afternoon (starting at 4:00 PM or 5:00 PM depending on the season). However, "free" does not mean "walk-in"; because of its immense popularity, you must book your free ticket online through the official museum website. These tickets are usually released 4 to 10 days in advance and disappear almost instantly. If you miss the Sunday window, residents of Barcelona can often visit for free on other specific holidays, such as the La Mercè festival in September. For tourists, if you cannot secure a free Sunday ticket, it is worth the €15–€20 fee to see one of the world's most comprehensive collections of Picasso's formative years.