The Museu de la Garrotxa is a free museum located in Castelldefels that focuses on the natural history and geology of the region. It offers a range of exhibits and displays that showcase the unique landscapes, flora, and fauna of the Garrotxa region. Visitors can learn about the volcanic activity that shaped the area, explore the diverse ecosystems, and discover the rich biodiversity of the region. The museum also offers educational programs and guided tours for nature enthusiasts of all ages.