The Museu de la Moda de Castelldefels is a free museum that showcases the evolution of fashion throughout history. It features a collection of vintage clothing, accessories, and fashion illustrations that highlight the changing trends and styles over the years. Visitors can explore different fashion eras, learn about the craftsmanship behind iconic garments, and discover the cultural influences on fashion. The museum also hosts fashion exhibitions, workshops, and talks by fashion experts, providing a fascinating insight into the world of fashion.