http://www.lapedrera.com/en/home https://www.lapedrera.com/en/frequently-asked-questions 19. What is the refund and cancellation policy? Changes or refunds are not accepted. Catalunya-La Pedrera Foundation, which manages La Pedrera, does not accept exchanges or returns of tickets, as reported during the process of the tickets online purchase through the platform of La Pedrera website.
https://www.lapedrera.com/en/frequently-asked-questions
19. What is the refund and cancellation policy?
Changes or refunds are not accepted. Catalunya-La Pedrera Foundation, which manages La Pedrera, does not accept exchanges or returns of tickets, as reported during the process of the tickets online purchase through the platform of La Pedrera website.