You can visit the Sagrada Familia for free. There's just one condition.

The Sagrada Familia is Barcelona's architectural jewel. Gaudí's masterpiece, scheduled for completion next year, has been attracting crowds of tourists for years. The upcoming La Mercè festival in Barcelona offers a chance to admire the basilica for free. Twenty thousand special tickets have been prepared for the occasion. To win them, you must enter a drawing.
Typically, admission to the Sagrada Familia can cost upwards of 140 złoty. So the announced drawing for free tickets, which will allow you to visit the famous structure on September 19, 20, 21, and 24 , seems like a real treat.
To participate in the drawing, complete the form on the Sagrada Familia website by September 14th and select a convenient day and time. Participants can complete only one form, and participants will be notified via email on September 15th if they were lucky.
During the tour, guests will be able to admire the basilica's façade and interior, and will also have access to an audio guide. The basilica's tower will be closed to visitors. Regular tickets will not be available for purchase on the indicated days.
Sagrada Familia is giving away ticketsThe impetus for organizing the lottery is the annual La Mercè festival, held in honor of Barcelona's patron saint, Our Lady of Grace (La Mare de Déu de la Mercè). As part of the event, numerous museums and institutions in Barcelona will open their doors to the public. La Mercè Festival is the largest and most important festival in the Catalan capital, held annually at the end of September. This year, the event will run from September 20th to 24th.
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